Unfortunately it's only for devices that came with android 3.1 preinstalled, basically the s21 series. No idea why, could be laziness by samsung to not optimise it, or a deal with Google, but whatever the reason its not coming.
Good on ya, hopefully android 12 L will also generally improve samsung tablet experience. While the features are good, general usability is still weird, not suited for a large screen, and laggy, so hopefully that changes. Unless the tab s8 gets the cool features and I don't 😞