I couldn’t find an “official” source, but some people suggested 7’3" gold medalist Arvydas Sabonis is currently the tallest.
If you include the Paralympics, 8’1" sitting volleyball gold medalist Morteza Mehrzad is almost certainly the tallest, as he’s the second tallest living person.
Dang, I definitely thought Yao at least got a bronze.
Not even close. Yao’s best finish was 8th.