Even with Verizon, it's gotten to be pretty rare that they actually broadcast anything in 4K. It gets used for "special events" (mostly sporting events) and such, but otherwise it typically just has a message that nothing is being broadcast *at this time*.
I'd love to see more content there, but given the bandwidth it uses, I can understand why it mainly is not used.
I also continue to have hopes that we'll see more content via ATSC 3.0 but ain't holding my breath on that. I have the appropriate HDHomerun device to receive same, but the content isn't there *yet* in my area. Coming soon (by end of the month if it doesn't get delayed again), but mostly just waiting for same.