Still no updte on note 20 ultra at&t

Try Smart switch on PC or manually check for software in settings if not then flash to latest with odin.
 
I've already done the Smart switch and it says it's up to date AT&t is just not putting it out on a lot of phones hs flashing your phone hard I've never done that
 
I have a sticky here in the Note Forum , I suggest going unlocked firmware that way you never worry on a Att model about not getting updates otherwise if you stay on the carrier you have to flash TMB firmware unless Att is on same firmware you probably have to flash with Odin again