Anyone in the industry have inside knowledge when local Houston TV stations might be broadcast ing any 4K content now that ATSC 3.0 is working?

Exciting times, ATSC 3.0 went live in Houston months backs and I’ve been able to pick up all the major stations in the new hvec format. All the content appears to be upslaced 1080p 59.94 fps. It looks good, but I’m curious when any of the networks with start broadcasting any 4K content. Searching Google seems to have random people indicate that lots of costly upgrades have to happen at stations before 4K content broadcast is even possible. Does anyone know? Is this weeks, months, years, or a decade before anything above 1080 hits the local airwaves?