The way 5G is designed, It will be 2030 before any 5G is found outside of Nairobi and Mombasa.
It needs too many small cell base stations and seeing how in the US they are being installed on street lights and like WiFi routers, we will have issues of vandalism and accidents disabling the network all over the place.
The current 3G and 4G base stations at least are protected via stone walls and guards or are on top of high buildings.
However as we do trials of 5G, we should be focusing heavily on ensuring 4G and 4G+ reaches every corner of the country so that we can retire the 3G network and farm the bands to enhance the 4G and 4G+ networks.