I found an article from May that said there are 38 out lesbians in the WNBA. There are 144 players in the WNBA. (I think. Apparently teams can have 11 or 12 player, so it could be between 132 and 144. I am not going to look at every roster.) That means 26% of the players are out. I found an article from 2018 that said 38% of players were lesbian. Either way, The roughly 62% out players on the Olympics team is much higher. But Cameron Brink is on the 3 by 3 team, so apparently they have other players stashed somewhere.
Candice Wiggins claimed that 98% of the league is lesbian, when she quit the league. (Candice is black.) But that is an exaggeration, since many of them are married.