Relaxed Truebox should have become active with Omens of War going live on Vaniki. Currently you can still only log in 1 char on a comp.
No, relaxed truebox becomes active when PoR is live. With 4 expansions releasing the same day, each one is staggered one hour apart. I don't play on Vaniki, but that should mean OoW was 2.5 hours ago, DoN was 1.5 hours ago, DoDH was 30 minutes ago, and PoR isn't out yet.