For the short article check the link.
For the actual map click the link to the right. As you scroll in on the map, more info shows up. "Yesterday, Ookla launched an interactive map that shows 303 5G networks currently deployed in 293 locations."
If 5G is as bad for us as some say it is, there ought to be reports saying so. I heard from a fellow in Florida who seems to be EMF sensitive and he had physical issues with Verizon testing 5G.
Some people have had issues with 4G.