In an interview with VentureBeat, Jerk Gustafsson, executive producer of the game, reveals it's currently unknown when RTX support will be ready:
GamesBeat: How does it look with raytracing support? Are there any scenes that look a lot more special when you can do realtime raytracing?
Gustafsson: We’re working together with Nvidia on that, but raytracing won’t be available at launch. The engineers at Nvidia are still hard at work getting that solution to look as good as possible for the game, and the date is still to be determined. But from what we’ve seen so far, it’ll be good.