Garmin Elevate 4.0 and the ECG app

Hi.

I have four questions:
1.) Venu 2 Plus, FR 255 and FR 265 have the "Garmin Elevate 4.0", correct?
2.) Only the Venu 2 Plus has the ECG app active for the "Garmin Elevate 4.0", correct?
3.) Does the Forerunner 965 also have the "Garmin Elevate 4.0"?
4.) Is there any indication that the ECG app is also coming for the FR 965?