But that stated, pretty much anything on Steam will be crossplay that is running on PC.
The only cross-play issues you are really going to have are PSVR to PC, as that may use different networks. However anything that requires you to log into a 3rd party system will likely work. (see Star Trek Bridge Crew / Rec Room.)
Main thing is I would say... get the games on Steam, and don't worry about it. It'll be fine.