NBC has released a list of television programs canceled or renewed for the 2020/2021 season. In the list, there is a one-line entry that lists:
Who Do You Think You Are? 11 (13 episodes) returning series which will debut (TBD)
You can find the entire list of NBC programs at: https://newslagoon.com/en/entertainment/cancelled-or-renewed-status-of-nbc-tv-shows/152227/.