Hi @Stiks The information I have is that Android 12 will start rolling out June 2022. See some information here https://9to5google.com/2021/12/03/samsung-android-12-update-rollout/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 4.0,Android 12 Official Version.