US unlocked straight-from-Samsung S21U.
Received the update yesterday.
Notification delay still hasn't been fixed but I'm not sure if this is a Samsung or Google/Android issue.
Methinks it's a Google/Android thing.
Specifically, the stand-by drain has reduced significantly.
I spent this weekend mostly watching TV and playing games, so wasn't using the phone heavily.
Was surprised that i got two and a half days of use on a single charge with 5+ hours of screen time.
The SOT is nothing to write home about (for a single day's use, it ranges from 6-7 hrs nowadays - up from the 5-5.5 hours in the first month), but I've never had such low standby drain on this phone before. That's where I'm pleased to see a significant improvement.