US Air Force weapons developers expect to operate reusable hypersonic drones by the 2040s. 

The Air Force and DARPA plan to have an improved hypersonic air vehicle by 2023.

* hypersonic weapons likely to be operational in the mid-2020s
* unmanned hypersonic spyplanes in 2030s
* recoverable hypersonic drones in the 2040s

Hypersonic weapons will be able to reach speeds of Mach 5 to Mach 10.

The US Air Force roadmap to hypersonic technology.