According to a report, Apple is moving its entire iPhone product stack to 5G modems from next year. Undoubtedly, Apple will continue to sell regional variants, including models in the US with 5G mmWave antennas. The change will finally bring 5G connectivity to the iPhone SE, too.
https://www.notebookcheck.net/Apple-will-only-sell-5G-capable-iPhones-from-next-year-onwards.551859.0.html