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Tab S7+ is on the quarterly update schedule so you should be getting the March update soon. March update was a bit late being released hitting phones only a week ago.
Here's a link showing the update frequency for Samsung. It is kind of fluid changing every once in a while but new tablets, including the S8, are quarterly.
Galaxy S21 Ultra 512g(VZW), Galaxy Book (original, VZW), Tab S8 Ultra, Tab S4, Galaxy Watch3 (VZW)