Resolves Yes if within 3 months of initial release,
Steam, Xbox and PS5 players of Monster Hunter Wilds will be able to do joint hunter with each other.
Resolves 50% if cross platform is available only between two platforms but not all three platforms.

Official link:

https://www.monsterhunter.com/wilds/en-us/
Steam link:
https://store.steampowered.com/app/2246340/Monster_Hunter_Wilds/