this part of article...........While there's not a single TV station in the world broadcasting 4K programming over the air, there are a handful of 4K TV channels on satellite, cable and IPTV. They amount to about 0.2% of cable/IPTV channels and 0.3% of Direct-to-Home (DTH) satellite TV channels, barely registering in this bar chart.

I believe 7-9 months ago... and I believe its in 8K content (No real content per say... but still broadcast...
Japanese broadcaster NHK today started broadcasting 8K on a permanent basis. NHK collectively refers to 4K / 8K as “Super Hi-Vision“, and with the 2020 Tokyo Olympic Games and the Paralympic Games not too far away, this is a major step in transitioning viewers to what the broadcaster is calling a “New era of full-scale super high vision”.