We’re just beginning to deploy 5G here in the USA.
5g is already deployed in the USA. Its the device technology using it that is lagging, I got a 5g phone last year.
I don’t know about 6g and what devices will use that soon.
It doesn’t do any good to deploy anything. It’s already obsolete.
There is not even universal 4G[LTE] coverage along all US Highways yet, if ever.