5G is already an official technology standard, via 3GPP Release 15, which was released in December 2018.
The "million dollar question" is really about when will 5G be everywhere, with the carrier-promised speed, latency and density. Our prediction is that by 2025 enough 5G infrastructure will be deployed nationwide for the majority of applications to fully benefit from 5G. The Ericsson Mobility Report predicts that by 2025, 29% of mobile subscriptions will be 5G.
Owning a 5G device might be exciting, but if you have a need for mobile 5G — for example 5G tablets for point-of-sale by service personnel — you don't want to have to utilize that device in a limited fashion. Early adopters can purchase 5G devices in the consumer space now. They are expensive, and have certain limitations on utility as the networks are building out. For commercial applications, 5G devices are now emerging on the market and we expect to see this market grow exponentially throughout the 2020's.