Thanks very much. My good friend
@ironass replied to a similar query here
https://forums.androidcentral.com/threads/should-i-be-getting-android-12-by-now.1044222/Basically, the phone won't auto update so it has to be flashed using Odin.
Herein lies a other problem, I am unable to give you guidance on this since this is Samsung's official website and I am unable to discuss unofficial methods of modifying devices.
I used to be a member of the Q & A team over at Android Central a few years back.
If you want help to update, there are some very helpful people over there.
I hope that helps.