As scheduled, at 10 AM local time on December 1st Japanese TV networks began publicly broadcasting 4K and 8K channels via satellite. Even after a couple of years of testing, NHK is currently the only one pushing content at 8K with 22.2 channel sound.

from https://www.engadget.com/2018/12/01/8k-japan-tv/
https://o.aolcdn.com/images/dims?resize=2000%2C2000%2Cshrink&image_uri=https%3A%2F%2Fs.yimg.com%2Fos%2Fcreatr-uploaded-images%2F2018-12%2Faa4a3430-f562-11e8-9eee-25101dd48437&client=a1acac3e1b3290917d92&signature=d06054b67a9a2e21681742217478f5c3fe033828