Myself running One UI 3.1 Android 11 phone is Galaxy note 20 ultra 5G hope this information help you some I am on the Verizon network & backup on MetroPCS is running Android 11 right now
Hopefully it stays that way. The in-screen fonger print scanner was slow on my s10+. I've tested it a few times with both thumbs and it seems to the performance has been fixed as well. I love the call screen video background option.