It's clear it's here. Get used to it. Verizon and the three Koreans are taking orders for 5G phones and will turn on the networks in April. Almost half of Korea is already built, mostly with 100-450 meg speed sub 6 GHz. No other country is close to half built, but AT&T intends to get there in 2020.
"We’ve talked about 200 million pops (60%) in 2020 being covered with 5G, that will be a software upgrade." CFO John Stephens
T-Mobile, which had to build a network for the newly-acquired 600 MHz band, intends to turn on NR across most of the country. It's almost a meaningless gesture; at 600 MHz, 5G NR adds very little to performance. (Much of the 5G enthusiasm is meaningless hype.)
At MWC, Huawei announced they had shipped 40,000 radios. Samsung has shipped 36,000.