diff --git a/CHANGELOG.md b/CHANGELOG.md
index 949399a14e..ca3745a6fb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,10 +1,31 @@
 ## vNext (TBD)
 
 ### Deprecations
-* None
+* The callback for `realm.syncSession.addProgressNotification` will only take a single argument in the future: `estimate` (which supports both partition based and flexible sync). The old callback functionality is deprecated and will be removed. The estimate is roughly equivalent to an estimated value of `transferred / transferable` in the deprecated partition-based sync callback. ([#6256](https://github.com/realm/realm-js/issues/6256))  
+```ts
+/** New callback which supports both flexible and partition-based sync */
+realm.syncSession.addProgressNotification(
+  Realm.ProgressDirection.Upload,
+  ProgressMode.ReportIndefinitely,
+  (estimate) => console.log(`progress estimate: ${estimate}/1.0`),
+);
+/** @deprecated */
+realm.syncSession.addProgressNotification(
+  Realm.ProgressDirection.Upload,
+  ProgressMode.ReportIndefinitely,
+  (transferred, transferable) => console.log(`progress: ${(transferred / transferable)}/1.0`),
+);
+```
 
 ### Enhancements
-* None
+* Added progress notifications support for flexible sync using a new callback argument. ([#6256](https://github.com/realm/realm-js/issues/6256))
+```ts
+realm.syncSession.addProgressNotification(
+  Realm.ProgressDirection.Upload,
+  ProgressMode.ReportIndefinitely,
+  (estimate) => console.log(`progress: ${estimate}/1.0`)
+);
+```
 
 ### Fixed
 * <How to hit and notice issue? what was the impact?> ([#????](https://github.com/realm/realm-js/issues/????), since v?.?.?)
diff --git a/integration-tests/tests/package.json b/integration-tests/tests/package.json
index f551f20266..aa14b78d52 100644
--- a/integration-tests/tests/package.json
+++ b/integration-tests/tests/package.json
@@ -84,6 +84,9 @@
     "@types/chai-as-promised": "^7.1.5",
     "@types/jsrsasign": "^10.5.4",
     "@types/mocha": "^10.0.0",
+    "@types/sinon": "9.0.5",
+    "@types/sinon-chai": "3.2.12",
+    "assert": "^2.1.0",
     "mocha": "^10.1.0",
     "nyc": "^15.1.0",
     "platform": "^1.3.6",
@@ -94,7 +97,9 @@
     "chai": "4.3.6",
     "chai-as-promised": "^7.1.1",
     "jsrsasign": "^11.0.0",
-    "node-fetch": "^3.3.2"
+    "node-fetch": "^3.3.2",
+    "sinon": "9.2.4",
+    "sinon-chai": "3.7.0"
   },
   "files": [
     "/src"
diff --git a/integration-tests/tests/src/setup-globals.ts b/integration-tests/tests/src/setup-globals.ts
index d7a4e6256e..8334b0ffa5 100644
--- a/integration-tests/tests/src/setup-globals.ts
+++ b/integration-tests/tests/src/setup-globals.ts
@@ -39,6 +39,9 @@ import chai from "chai";
 // See https://stackoverflow.com/a/45882252
 chai.config.truncateThreshold = 0;
 
+import sinonChai from "sinon-chai";
+chai.use(sinonChai);
+
 import chaiAsPromised from "chai-as-promised";
 chai.use(chaiAsPromised);
 
diff --git a/integration-tests/tests/src/tests/sync/flexible.ts b/integration-tests/tests/src/tests/sync/flexible.ts
index fe97d1b20a..6215bf2368 100644
--- a/integration-tests/tests/src/tests/sync/flexible.ts
+++ b/integration-tests/tests/src/tests/sync/flexible.ts
@@ -39,6 +39,9 @@ import Realm, {
   SubscriptionSetState,
   CompensatingWriteError,
   WaitForSync,
+  ProgressMode,
+  Credentials,
+  OpenRealmBehaviorType,
 } from "realm";
 
 import { authenticateUserBefore, importAppBefore, openRealmBeforeEach } from "../../hooks";
@@ -47,6 +50,7 @@ import { expectClientResetError } from "../../utils/expect-sync-error";
 import { createSyncConfig } from "../../utils/open-realm";
 import { createPromiseHandle } from "../../utils/promise-handle";
 import { buildAppConfig } from "../../utils/build-app-config";
+import { spy } from "sinon";
 
 export const PersonSchema: Realm.ObjectSchema = {
   name: "Person",
@@ -57,6 +61,7 @@ export const PersonSchema: Realm.ObjectSchema = {
     name: "string",
     friends: "Person[]",
     nonQueryable: "string?",
+    data: "data?",
   },
 };
 
@@ -66,6 +71,7 @@ export class Person extends Realm.Object<Person> {
   age!: number;
   friends!: Realm.List<Person>;
   dogs!: Realm.Collection<Dog>;
+  data?: Realm.Types.Data;
 
   static schema: Realm.ObjectSchema = PersonSchema;
 }
@@ -2075,4 +2081,400 @@ describe("Flexible sync", function () {
       });
     });
   });
+
+  describe("Progress notification", function () {
+    this.timeout(5000);
+    before(async function (this: UserContext) {
+      // TODO: Investigate this.
+      // Use a new user for this test suite as not doing so causes some session issues in other tests
+      this.user = await this.app.logIn(Credentials.anonymous(false));
+    });
+    beforeEach(async function (this: RealmContext & UserContext) {
+      // @ts-expect-error Using an internal API
+      this.realm = new Realm({
+        schema: [Person, Dog],
+        sync: {
+          flexible: true,
+          user: this.user,
+          _sessionStopPolicy: SessionStopPolicy.Immediately,
+        },
+      });
+    });
+
+    it("only estimate callback is allowed", async function (this: RealmContext) {
+      // eslint-disable-next-line @typescript-eslint/no-unused-vars, @typescript-eslint/no-empty-function
+      const callback = (estimate: number) => {};
+      this.realm.syncSession?.addProgressNotification(
+        Realm.ProgressDirection.Download,
+        Realm.ProgressMode.ForCurrentlyOutstandingWork,
+        callback,
+      );
+    });
+
+    it("old callback style is not allowed", async function (this: RealmContext) {
+      // eslint-disable-next-line @typescript-eslint/no-unused-vars, @typescript-eslint/no-empty-function
+      const callback = spy((transferable: number, transferred: number) => {});
+      expect(() => {
+        this.realm.syncSession?.addProgressNotification(
+          Realm.ProgressDirection.Download,
+          Realm.ProgressMode.ForCurrentlyOutstandingWork,
+          callback,
+        );
+      }).to.throw();
+
+      expect(callback).not.called;
+    });
+
+    describe("with ProgressMode.ReportIndefinitely", function () {
+      describe(`with ProgressDirection.Upload`, function () {
+        it("should not call callback when there is nothing to upload", async function (this: RealmContext) {
+          const realm = this.realm;
+          // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
+          const callback = spy((estimate: number) => {});
+
+          realm.syncSession?.addProgressNotification(
+            Realm.ProgressDirection.Upload,
+            ProgressMode.ReportIndefinitely,
+            callback,
+          );
+
+          expect(callback).not.called;
+        });
+
+        it("should be called multiple times with different values during uploads", async function (this: RealmContext) {
+          const realm = this.realm;
+          // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
+          const callback = spy((estimate: number) => {});
+
+          realm.syncSession?.addProgressNotification(
+            Realm.ProgressDirection.Upload,
+            Realm.ProgressMode.ReportIndefinitely,
+            callback,
+          );
+
+          await this.realm.syncSession?.uploadAllLocalChanges();
+          await this.realm.syncSession?.downloadAllServerChanges();
+
+          // TODO: This callback should not be called at this stage but seems flakey
+          // and gets called with 1.0 at times, likely because of a race condition.
+          expect(callback.notCalled || callback.calledWith(1.0)).is.true;
+          const subscription = await realm.objects(Person).subscribe();
+
+          realm.write(() => {
+            realm.create(Person, {
+              _id: new BSON.ObjectId(),
+              name: "Heavy",
+              age: 36,
+              data: new ArrayBuffer(1_000_000),
+            });
+          });
+
+          await realm.syncSession?.uploadAllLocalChanges();
+          subscription.unsubscribe();
+
+          // TODO: Find a way to fix
+          // There should be at least one point where the progress is not yet finished.
+          // expect(callback.args.find(([estimate]) => estimate < 1)).to.not.be.undefined;
+
+          expect(callback.withArgs(1.0)).called;
+        });
+
+        it("should not run after it has been removed", async function (this: RealmContext) {
+          const realm = this.realm;
+          // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
+          const callback = spy((estimate: number) => {});
+
+          realm.syncSession?.addProgressNotification(
+            Realm.ProgressDirection.Upload,
+            Realm.ProgressMode.ReportIndefinitely,
+            callback,
+          );
+
+          await this.realm.syncSession?.uploadAllLocalChanges();
+          await this.realm.syncSession?.downloadAllServerChanges();
+
+          // TODO: This callback should not be called at this stage but seems flakey
+          // and gets called with 1.0 at times, likely because of a race condition.
+          expect(callback.notCalled || callback.calledWith(1.0)).is.true;
+
+          realm.objects(Person).subscribe();
+
+          realm.write(() => {
+            realm.create(Person, {
+              _id: new BSON.ObjectId(),
+              name: "Heavy",
+              age: 36,
+              data: new ArrayBuffer(1_000_000),
+            });
+          });
+
+          await realm.syncSession?.uploadAllLocalChanges();
+          await realm.syncSession?.downloadAllServerChanges();
+          const oldCallCount = callback.callCount;
+          expect(callback.callCount).to.be.greaterThanOrEqual(2);
+
+          realm.syncSession?.removeProgressNotification(callback);
+
+          realm.write(() => {
+            realm.create(Person, {
+              _id: new BSON.ObjectId(),
+              name: "Heavy",
+              age: 36,
+              data: new ArrayBuffer(1_000_000),
+            });
+          });
+
+          await realm.syncSession?.uploadAllLocalChanges();
+
+          expect(callback.callCount).to.be.equal(oldCallCount);
+        });
+      });
+
+      describe(`with ProgressDirection.Download`, function () {
+        it("should not call the callback when there is nothing to download", async function (this: RealmContext) {
+          const realm = this.realm;
+          // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
+          const callback = spy((estimate: number) => {});
+
+          realm.syncSession?.addProgressNotification(
+            Realm.ProgressDirection.Download,
+            ProgressMode.ReportIndefinitely,
+            callback,
+          );
+
+          await this.realm.syncSession?.uploadAllLocalChanges();
+          await this.realm.syncSession?.downloadAllServerChanges();
+
+          // TODO: This callback should not be called at this stage but seems flakey
+          // and gets called with 1.0 at times, likely because of a race condition.
+          expect(callback.notCalled || callback.calledWith(1.0)).is.true;
+        });
+
+        it("should be called multiple times with different values during downloads", async function (this: RealmContext &
+          AppContext) {
+          const realm = this.realm;
+          // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
+          const callback = spy((estimate: number) => {});
+          const realm2 = await Realm.open({
+            schema: [Person, Dog],
+            sync: {
+              flexible: true,
+              user: await this.app.logIn(Credentials.anonymous(false)),
+              newRealmFileBehavior: {
+                type: OpenRealmBehaviorType.OpenImmediately,
+              },
+            },
+          });
+
+          realm2.syncSession?.addProgressNotification(
+            Realm.ProgressDirection.Download,
+            Realm.ProgressMode.ReportIndefinitely,
+            callback,
+          );
+
+          const subscription = await realm.objects(Person).subscribe();
+
+          realm.write(() => {
+            realm.create(Person, {
+              _id: new BSON.ObjectId(),
+              name: "Heavy",
+              age: 36,
+              data: new ArrayBuffer(1_000_000),
+            });
+          });
+
+          await realm.syncSession?.uploadAllLocalChanges();
+          const subscription2 = await realm2.objects(Person).subscribe();
+          await realm2.syncSession?.downloadAllServerChanges();
+
+          expect(callback.args.find(([estimate]) => estimate < 1)).to.not.be.undefined;
+          expect(callback.withArgs(1.0).callCount).is.greaterThanOrEqual(2);
+
+          subscription.unsubscribe();
+          subscription2.unsubscribe();
+          realm2.close();
+        });
+
+        it("should not run after it has been removed", async function (this: RealmContext) {
+          const realm = this.realm;
+          // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
+          const callback = spy((estimate: number) => {});
+          const realm2 = await Realm.open({
+            schema: [Person, Dog],
+            sync: {
+              flexible: true,
+              user: await this.app.logIn(Credentials.anonymous(false)),
+              newRealmFileBehavior: {
+                type: OpenRealmBehaviorType.OpenImmediately,
+              },
+            },
+          });
+
+          realm2.syncSession?.addProgressNotification(
+            Realm.ProgressDirection.Download,
+            Realm.ProgressMode.ReportIndefinitely,
+            callback,
+          );
+
+          const subscription = await realm.objects(Person).subscribe();
+
+          realm.write(() => {
+            realm.create(Person, {
+              _id: new BSON.ObjectId(),
+              name: "Heavy",
+              age: 36,
+              data: new ArrayBuffer(1_000_000),
+            });
+          });
+
+          const subscription2 = await realm2.objects(Person).subscribe();
+          await realm.syncSession?.uploadAllLocalChanges();
+          await realm2.syncSession?.downloadAllServerChanges();
+
+          expect(callback.args.find(([estimate]) => estimate < 1)).to.not.be.undefined;
+          expect(callback.withArgs(1.0).callCount).is.greaterThanOrEqual(2);
+          const oldCallCount = callback.callCount;
+
+          realm2.syncSession?.removeProgressNotification(callback);
+
+          realm.write(() => {
+            realm.create(Person, {
+              _id: new BSON.ObjectId(),
+              name: "Heavy",
+              age: 36,
+              data: new ArrayBuffer(1_000_000),
+            });
+          });
+
+          await realm.syncSession?.uploadAllLocalChanges();
+          await realm2.syncSession?.downloadAllServerChanges();
+
+          expect(callback).has.callCount(oldCallCount);
+
+          subscription.unsubscribe();
+          subscription2.unsubscribe();
+          realm2.close();
+        });
+      });
+    });
+
+    describe("with ProgressMode.ForCurrentlyOutstandingWork", () => {
+      describe(`with ProgressDirection.Upload`, function () {
+        it("should not call callback when there is nothing to upload", async function (this: RealmContext) {
+          const realm = this.realm;
+          // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
+          const callback = spy((estimate: number) => {});
+
+          await realm.syncSession?.uploadAllLocalChanges();
+
+          realm.syncSession?.addProgressNotification(
+            Realm.ProgressDirection.Upload,
+            ProgressMode.ForCurrentlyOutstandingWork,
+            callback,
+          );
+
+          expect(callback).not.called;
+        });
+
+        it("should be called multiple times with different values during uploads", async function (this: RealmContext) {
+          const realm = this.realm;
+          // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
+          const callback = spy((estimate: number) => {});
+
+          realm.syncSession?.addProgressNotification(
+            Realm.ProgressDirection.Upload,
+            Realm.ProgressMode.ForCurrentlyOutstandingWork,
+            callback,
+          );
+
+          const subscription = await realm.objects(Person).subscribe();
+
+          realm.write(() => {
+            realm.create(Person, {
+              _id: new BSON.ObjectId(),
+              name: "Heavy",
+              age: 36,
+              data: new ArrayBuffer(1_000_000),
+            });
+          });
+
+          await realm.syncSession?.uploadAllLocalChanges();
+
+          // TODO: Find a way to fix
+          // There should be at least one point where the progress is not yet finished.
+          // expect(callback.args.find(([estimate]) => estimate < 1)).to.not.be.undefined;
+
+          expect(callback.withArgs(1.0)).called;
+
+          subscription.unsubscribe();
+        });
+      });
+
+      describe(`with ProgressDirection.Download`, function () {
+        it("should not call callback when there is nothing to download", async function (this: RealmContext) {
+          const realm = this.realm;
+          // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
+          const callback = spy((estimate: number) => {});
+
+          await realm.syncSession?.downloadAllServerChanges();
+
+          realm.syncSession?.addProgressNotification(
+            Realm.ProgressDirection.Download,
+            ProgressMode.ForCurrentlyOutstandingWork,
+            callback,
+          );
+
+          expect(callback).not.called;
+        });
+
+        it("should be called multiple times with different values during downloads", async function (this: RealmContext &
+          AppContext) {
+          const realm = this.realm;
+          // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/no-unused-vars
+          const callback = spy((estimate: number) => {});
+          const realm2 = await Realm.open({
+            schema: [Person, Dog],
+            sync: {
+              flexible: true,
+              user: await this.app.logIn(Credentials.anonymous(false)),
+              newRealmFileBehavior: {
+                type: OpenRealmBehaviorType.OpenImmediately,
+              },
+            },
+          });
+
+          const subscription = await realm.objects(Person).subscribe();
+
+          realm.write(() => {
+            realm.create(Person, {
+              _id: new BSON.ObjectId(),
+              name: "Heavy",
+              age: 36,
+              data: new ArrayBuffer(1_000_000),
+            });
+          });
+
+          await realm.syncSession?.uploadAllLocalChanges();
+          await realm2.objects(Person).subscribe();
+          await realm2.syncSession?.downloadAllServerChanges();
+
+          // At this point there is no other work.
+          realm2.syncSession?.addProgressNotification(
+            Realm.ProgressDirection.Download,
+            Realm.ProgressMode.ForCurrentlyOutstandingWork,
+            callback,
+          );
+
+          // TODO: Doesn't work
+          // There should be at least one point where the progress is not yet finished.
+          // expect(callback.args.find(([estimate]) => estimate < 1)).to.not.be.undefined;
+
+          expect(callback.withArgs(1.0)).calledOnce;
+          realm2.close();
+
+          subscription.unsubscribe();
+        });
+      });
+    });
+  });
 });
diff --git a/integration-tests/tests/src/tests/sync/sync-session.ts b/integration-tests/tests/src/tests/sync/sync-session.ts
index ded450008d..a9d6f4df13 100644
--- a/integration-tests/tests/src/tests/sync/sync-session.ts
+++ b/integration-tests/tests/src/tests/sync/sync-session.ts
@@ -22,8 +22,9 @@ import { authenticateUserBefore, importAppBefore, openRealmBefore } from "../../
 import { DogSchema } from "../../schemas/person-and-dog-with-object-ids";
 import { getRegisteredEmailPassCredentials } from "../../utils/credentials";
 import { generatePartition } from "../../utils/generators";
-import { sleep, throwAfterTimeout } from "../../utils/sleep";
+import { sleep } from "../../utils/sleep";
 import { buildAppConfig } from "../../utils/build-app-config";
+import { spy } from "sinon";
 
 const DogForSyncSchema: Realm.ObjectSchema = {
   name: "Dog",
@@ -286,16 +287,14 @@ describe("SessionTest", () => {
   describe("progress notification", () => {
     afterEach(() => Realm.clearTestState());
     it("is called", async function (this: AppContext) {
+      this.timeout(5000);
       const partition = generatePartition();
       const { config } = await getSyncConfWithUser(this.app, partition);
-      let progressCalled = false;
-      await Promise.race([
-        Realm.open(config).progress(() => {
-          progressCalled = true;
-        }),
-        throwAfterTimeout(5000),
-      ]);
-      expect(progressCalled).to.be.true;
+
+      const progressCallback = spy();
+      await Realm.open(config).progress(progressCallback);
+
+      expect(progressCallback).called;
     });
 
     it("removing progress notification does not invoke callback again", async function (this: AppContext) {
@@ -339,8 +338,8 @@ describe("SessionTest", () => {
         realm.syncSession?.addProgressNotification("upload", "reportIndefinitely", progressCallback);
         writeDataFunc();
       });
-      await realm.close();
-      user.logOut();
+      realm.close();
+      await user.logOut();
     });
   });
 
diff --git a/package-lock.json b/package-lock.json
index 960e9fc2b8..f7fc9a13a7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -429,7 +429,9 @@
         "chai": "4.3.6",
         "chai-as-promised": "^7.1.1",
         "jsrsasign": "^11.0.0",
-        "node-fetch": "^3.3.2"
+        "node-fetch": "^3.3.2",
+        "sinon": "9.2.4",
+        "sinon-chai": "3.7.0"
       },
       "devDependencies": {
         "@realm/app-importer": "*",
@@ -439,6 +441,9 @@
         "@types/chai-as-promised": "^7.1.5",
         "@types/jsrsasign": "^10.5.4",
         "@types/mocha": "^10.0.0",
+        "@types/sinon": "9.0.5",
+        "@types/sinon-chai": "3.2.12",
+        "assert": "^2.1.0",
         "mocha": "^10.1.0",
         "nyc": "^15.1.0",
         "platform": "^1.3.6",
@@ -454,6 +459,15 @@
       "integrity": "sha512-dJvrYWxP/UcXm36Qn36fxhUKu8A/xMRXVT2cliFF1Z7UA9liG5Psj3ezNSZw+5puH2czDXRLcXQxf8JbJt0ejg==",
       "dev": true
     },
+    "integration-tests/tests/node_modules/@types/sinon": {
+      "version": "9.0.5",
+      "resolved": "https://registry.npmjs.org/@types/sinon/-/sinon-9.0.5.tgz",
+      "integrity": "sha512-4CnkGdM/5/FXDGqL32JQ1ttVrGvhOoesLLF7VnTh4KdjK5N5VQOtxaylFqqTjnHx55MnD9O02Nbk5c1ELC8wlQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/sinonjs__fake-timers": "*"
+      }
+    },
     "integration-tests/tests/node_modules/brace-expansion": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
@@ -2835,7 +2849,6 @@
       "version": "10.5.0",
       "resolved": "https://registry.npmjs.org/@chevrotain/cst-dts-gen/-/cst-dts-gen-10.5.0.tgz",
       "integrity": "sha512-lhmC/FyqQ2o7pGK4Om+hzuDrm9rhFYIJ/AXoQBeongmn870Xeb0L6oGEiuR8nohFNL5sMaQEJWCxr1oIVIVXrw==",
-      "dev": true,
       "dependencies": {
         "@chevrotain/gast": "10.5.0",
         "@chevrotain/types": "10.5.0",
@@ -2846,7 +2859,6 @@
       "version": "10.5.0",
       "resolved": "https://registry.npmjs.org/@chevrotain/gast/-/gast-10.5.0.tgz",
       "integrity": "sha512-pXdMJ9XeDAbgOWKuD1Fldz4ieCs6+nLNmyVhe2gZVqoO7v8HXuHYs5OV2EzUtbuai37TlOAQHrTDvxMnvMJz3A==",
-      "dev": true,
       "dependencies": {
         "@chevrotain/types": "10.5.0",
         "lodash": "4.17.21"
@@ -2855,20 +2867,17 @@
     "node_modules/@chevrotain/types": {
       "version": "10.5.0",
       "resolved": "https://registry.npmjs.org/@chevrotain/types/-/types-10.5.0.tgz",
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       }
@@ -25327,6 +25551,19 @@
       "integrity": "sha512-4+wkEYLBbWxqTahEsWrhxepcoVOJ+1z5PGIjPZxRkytcdSUaNjIjBM7Xn8E+pdSuV7SzvWovBFA54FO0JSoqhA==",
       "dev": true
     },
+    "node_modules/util": {
+      "version": "0.12.5",
+      "resolved": "https://registry.npmjs.org/util/-/util-0.12.5.tgz",
+      "integrity": "sha512-kZf/K6hEIrWHI6XqOFUiiMa+79wE/D8Q+NCNAWclkyg3b4d2k7s0QGepNjiABc+aR3N1PAyHL7p6UcLY6LmrnA==",
+      "dev": true,
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "is-arguments": "^1.0.4",
+        "is-generator-function": "^1.0.7",
+        "is-typed-array": "^1.1.3",
+        "which-typed-array": "^1.1.2"
+      }
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -25363,8 +25600,7 @@
     "node_modules/v8-compile-cache-lib": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",
-      "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg==",
-      "dev": true
+      "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg=="
     },
     "node_modules/v8-to-istanbul": {
       "version": "9.2.0",
@@ -26385,7 +26621,6 @@
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
       "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
-      "dev": true,
       "engines": {
         "node": ">=6"
       }
@@ -27214,7 +27449,6 @@
       "version": "11.1.0",
       "resolved": "https://registry.npmjs.org/@commander-js/extra-typings/-/extra-typings-11.1.0.tgz",
       "integrity": "sha512-GuvZ38d23H+7Tz2C9DhzCepivsOsky03s5NI+KCy7ke1FNUvsJ2oO47scQ9YaGGhgjgNW5OYYNSADmbjcSoIhw==",
-      "dev": true,
       "peerDependencies": {
         "commander": "11.1.x"
       }
@@ -27223,7 +27457,6 @@
       "version": "11.1.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-11.1.0.tgz",
       "integrity": "sha512-yPVavfyCcRhmorC7rWlkHn15b4wDVgVmBA7kV4QVBsF7kv/9TKJAbAXVTxvTnwP8HHKjRCJDClKbciiYS7p0DQ==",
-      "dev": true,
       "engines": {
         "node": ">=16"
       }
@@ -27231,7 +27464,6 @@
     "packages/realm/bindgen/vendor/realm-core": {
       "name": "@realm/bindgen",
       "version": "0.1.0",
-      "dev": true,
       "dependencies": {
         "@commander-js/extra-typings": "^11.1.0",
         "@types/node": "^18.15.10",
diff --git a/packages/realm/bindgen/js_opt_in_spec.yml b/packages/realm/bindgen/js_opt_in_spec.yml
index b28279f781..ef80c1274e 100644
--- a/packages/realm/bindgen/js_opt_in_spec.yml
+++ b/packages/realm/bindgen/js_opt_in_spec.yml
@@ -569,6 +569,7 @@ classes:
       - start
       - cancel
       - register_download_progress_notifier
+      - unregister_download_progress_notifier
       # JS-specific
       - DOLLAR_resetSharedPtr
 
diff --git a/packages/realm/package.json b/packages/realm/package.json
index ed03799e88..25052101dc 100644
--- a/packages/realm/package.json
+++ b/packages/realm/package.json
@@ -357,4 +357,4 @@
       6
     ]
   }
-}
+}
\ No newline at end of file
diff --git a/packages/realm/src/ProgressRealmPromise.ts b/packages/realm/src/ProgressRealmPromise.ts
index 2164013b13..b041359f09 100644
--- a/packages/realm/src/ProgressRealmPromise.ts
+++ b/packages/realm/src/ProgressRealmPromise.ts
@@ -18,8 +18,10 @@
 
 import {
   Configuration,
+  DynamicProgressNotificationCallback,
   OpenRealmBehaviorType,
   OpenRealmTimeOutBehavior,
+  PartitionBasedSyncProgressNotificationCallback,
   ProgressNotificationCallback,
   PromiseHandle,
   Realm,
@@ -82,6 +84,8 @@ export class ProgressRealmPromise implements Promise<Realm> {
   private handle = new PromiseHandle<Realm>();
   /** @internal */
   private timeoutPromise: TimeoutPromise<Realm> | null = null;
+  /** @internal */
+  private token = 0;
 
   /** @internal */
   constructor(config: Configuration) {
@@ -134,13 +138,16 @@ export class ProgressRealmPromise implements Promise<Realm> {
               this.handle.reject(err);
             }
           });
-        // TODO: Consider storing the token returned here to unregister when the task gets cancelled,
-        // if for some reason, that doesn't happen internally
-        this.task.registerDownloadProgressNotifier(this.emitProgress);
+        if (this.listeners.size > 0) {
+          this.token = this.task.registerDownloadProgressNotifier(this.emitProgress);
+        }
       } else {
         throw new Error(`Unexpected open behavior '${openBehavior}'`);
       }
     } catch (err) {
+      if (this.token !== 0) {
+        this.task?.unregisterDownloadProgressNotifier(this.token);
+      }
       this.handle.reject(err);
     }
   }
@@ -153,6 +160,7 @@ export class ProgressRealmPromise implements Promise<Realm> {
   cancel(): void {
     this.cancelAndResetTask();
     this.timeoutPromise?.cancel();
+    this.task?.unregisterDownloadProgressNotifier(this.token);
     // Clearing all listeners to avoid accidental progress notifications
     this.listeners.clear();
     // Tell anything awaiting the promise
@@ -167,6 +175,13 @@ export class ProgressRealmPromise implements Promise<Realm> {
    */
   progress(callback: ProgressNotificationCallback): this {
     this.listeners.add(callback);
+    if (callback.length === 1) {
+      const estimateCallback = callback as DynamicProgressNotificationCallback;
+      estimateCallback(1.0);
+    } else {
+      const pbsCallback = callback as PartitionBasedSyncProgressNotificationCallback;
+      pbsCallback(0.0, 0.0);
+    }
     return this;
   }
 
@@ -174,11 +189,17 @@ export class ProgressRealmPromise implements Promise<Realm> {
   catch = this.handle.promise.catch.bind(this.handle.promise);
   finally = this.handle.promise.finally.bind(this.handle.promise);
 
-  private emitProgress = (transferredArg: binding.Int64, transferableArg: binding.Int64) => {
+  private emitProgress = (transferredArg: binding.Int64, transferableArg: binding.Int64, progressEstimate: number) => {
     const transferred = binding.Int64.intToNum(transferredArg);
     const transferable = binding.Int64.intToNum(transferableArg);
     for (const listener of this.listeners) {
-      listener(transferred, transferable);
+      if (listener.length === 1) {
+        const estimateListener = listener as DynamicProgressNotificationCallback;
+        estimateListener(progressEstimate);
+      } else {
+        const pbsListener = listener as PartitionBasedSyncProgressNotificationCallback;
+        pbsListener(transferred, transferable);
+      }
     }
   };
 
diff --git a/packages/realm/src/app-services/SyncSession.ts b/packages/realm/src/app-services/SyncSession.ts
index ab4f908378..3b732d248f 100644
--- a/packages/realm/src/app-services/SyncSession.ts
+++ b/packages/realm/src/app-services/SyncSession.ts
@@ -53,13 +53,29 @@ export enum ProgressMode {
   ForCurrentlyOutstandingWork = "forCurrentlyOutstandingWork",
 }
 
-export type ProgressNotificationCallback =
+/** @deprecated */
+export type PartitionBasedSyncProgressNotificationCallback =
   /**
+   * This notification callback only supports Partition Based Sync.
    * @param transferred - The current number of bytes already transferred
    * @param transferable - The total number of transferable bytes (i.e. the number of bytes already transferred plus the number of bytes pending transfer)
+   * @deprecated - This notification callback will be removed in next major release. Use {@link DynamicProgressNotificationCallback} instead.
+   * @since 1.12.0
    */
   (transferred: number, transferable: number) => void;
 
+export type DynamicProgressNotificationCallback =
+  /**
+   * This notification callback supports both Partition Based Sync and Flexible Sync.
+   * @param estimate - An estimate between 0.0 and 1.0 of how much have been transferred.
+   * @since 12.10.0
+   */
+  (estimate: number) => void;
+
+export type ProgressNotificationCallback =
+  | PartitionBasedSyncProgressNotificationCallback
+  | DynamicProgressNotificationCallback;
+
 export enum ConnectionState {
   Disconnected = "disconnected",
   Connecting = "connecting",
@@ -93,6 +109,21 @@ function toBindingDirection(direction: ProgressDirection) {
   }
 }
 
+function isEstimateProgressNotification(cb: ProgressNotificationCallback): cb is DynamicProgressNotificationCallback {
+  return cb.length === 1;
+}
+
+function toBindingProgressNotificationCallback(cb: ProgressNotificationCallback) {
+  if (isEstimateProgressNotification(cb)) {
+    return (transferredBytes: binding.Int64, transferrableBytes: binding.Int64, progressEstimate: number) =>
+      cb(progressEstimate);
+  } else {
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    return (transferredBytes: binding.Int64, transferrableBytes: binding.Int64, _: number) =>
+      cb(transferrableBytes, transferrableBytes);
+  }
+}
+
 function fromBindingConnectionState(state: binding.SyncSessionConnectionState) {
   if (state === binding.SyncSessionConnectionState.Connected) {
     return ConnectionState.Connected;
@@ -251,7 +282,7 @@ const PROGRESS_LISTENERS = new Listeners<
 >({
   add(callback, weakInternal, internal, direction, mode) {
     const token = internal.registerProgressNotifier(
-      (transferred, transferable) => callback(Number(transferred), Number(transferable)),
+      toBindingProgressNotificationCallback(callback),
       toBindingDirection(direction),
       mode === ProgressMode.ReportIndefinitely,
     );
@@ -441,12 +472,17 @@ export class SyncSession {
    * Can be either:
    *  - `reportIndefinitely` - the registration will stay active until the callback is unregistered
    *  - `forCurrentlyOutstandingWork` - the registration will be active until only the currently transferable bytes are synced
-   * @param callback - Called with the following arguments:
-   * 1. `transferred`: The current number of bytes already transferred
-   * 2. `transferable`: The total number of transferable bytes (the number of bytes already transferred plus the number of bytes pending transfer)
+   * @param callback - see {@link DynamicProgressNotificationCallback} and {@link PartitionBasedSyncProgressNotificationCallback}
+   * @throws if signature of `callback` doesn't match requirements for sync mode
    * @since 1.12.0
    */
   addProgressNotification(direction: ProgressDirection, mode: ProgressMode, callback: ProgressNotificationCallback) {
+    if (this.config.flexible) {
+      assert(
+        isEstimateProgressNotification(callback),
+        `For flexible sync the callback can only take one argument - got ${callback.length} arguments`,
+      );
+    }
     this.withInternal((internal) => PROGRESS_LISTENERS.add(callback, this.weakInternal, internal, direction, mode));
   }
   /**