Yes first announced 7 yrs ago and some manufacturers had 5G devices before mobile networks went live with 5G
5G deployments in the United States weren’t for mobile devices at all. 2017, carriers began trialing fixed wireless 5G services as a replacement for wired broadband home internet. Closed trials of 5G home internet ran well into 2018 before becoming commercially available
wasn’t until early 2019 that the first 5G mobile networks rolled out. Verizon led the way in April