Sorry to say but its still months away before the S21 gets Android 15 since its still in beta on the S24's and once that's finished it will be pushed to the S24'S - Fold/Flip 6's - S23's - Fold/Flip 5's - S22'S - Fold/Flip 4's not to mention the A models that will get it also and then the S21's will get it after everything else
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Don't cross your fingers lol. Budget devices are already being released with stable one UI 7. My guess is we won't see One UI 7 on flagship devices for a long time.
