I like this straightforward FAQ from their website
Q: WHEN? HOW MUCH?
A: August 13th 2019 for PC on the Epic Games Store! 30 bucks, euros or local equivalent.
Q: OK, but what about Steam? GoG? Humble?
A: It’ll hit Steam 12 months later, around August 13th 2020. We’ll consider other storefronts at that time too.
Q: All right, how about consoles?
A: PS4 and Switch versions are on the way; we just need time to complete ‘em, polish ‘em, rate ‘em, and certify ‘em.
Q: Wait, no Xbox?!
A: We’re considering it, but it would be after PC and other console versions. Keep checking back!
Q: Mac? LINUX?
A: Nuh uh. Sorry, just numbers. And who knows what's happening with OpenGL there.