Hanna It does not appear that it has been merged yet, in which case it would not be available yet.
Hanna What update channel (Alpha or Beta) should I choose to receive this update?
If it is merged and makes it through alpha and beta testing, then it will appear on stable devices without any change being made. If it is yanked from alpha or beta, and does not make it to stable, presumably that will mean a serious problem occurred.
If you are willing to join the testing chat room and provide rapid feedback, and if it will be OK if the update somehow makes trouble on your device, then you might join the beta or alpha channel. The project would appreciate more testers, but it's important to be aware of what is entailed.