I've been wondering the same thing.  I thought we heard something about them having an in-country training camp somewhere in Japan.  (I think we heard this about the men's team and they said the women's team would be in a different location from the men.)

In the interviews, Suni has expressed apprehension about having to spend a lot of time isolated and mentioned maybe they'd have to play board games to keep from being on their phones too much.  I guess that's a likely approach from someone with younger siblings, but I would have thought "cards"  -- then wait for the influx of gymnasts on the World Poker Tour after the Olympics.