I have no update Oxygen os 12
Because it hasn't been rolled out yet.
You can opt for open beta 1 but before shifting on beta please go through known issues and understad what close beta is.
Of you want to go for official os 12 then wait for atleast 2-3 month.
Don't use beta 1 because it has so many bugs ,wait for stable release ,they already include colour os launcher and other stuff so your user experience might not good if u like current oxygen os ,it will completely change next year which might be biggest mistake of OnePlus because majority people buyed OnePlus for their clean and pure oxygen os experience
Android 12 is still under development for your device model. There is no ETA.
Please read and use this thread for further discussion
OxygenOS 12 FAQ: Find your answer
by Gary C., 2021-12-07