I have been waiting for it but I have yet to see any tuners for sale. I just upgraded my TV to one with HDMI 2.1 and I am not going through it again. The FCC should not be too involved in what electronic manufacturers and broadcaster choose to do. I also hope that this will be the FINAL OTA upgrade, because we do not need to keep seeing these change as TV's tech changes!
We need for there to be a maxed out quality signal and then set it and forget it. ATSC 3.0 seems like a good way to set it and forget it, but they could keep this for the next 50 years. I think TV broadcasts in 4K HDR will suffice. If nothing else, switch to 1080P. On the other hand, it does threaten 4K blu-ray... To a degree...