FWIW, all my OW1 unlocks showed up fine on my XSX on launch night and they’re still there on my Switch as of this morning.
I remember getting prompted last week to make sure my console account was connected to my main Bnet account, and on the Switch, it specifically says “Account Merge: Complete” on my main menu (I think that’s a recent add, as there was no such indicator when I played on XSX on Tuesday night).