Awkward... The website FAQs still say "XB-1 test flights are planned for early 2022."
https://interestingengineering.com/culture/boom-xb1-superson...
https://www.denverpost.com/2017/06/20/centennial-boom-supers...
https://www.flightglobal.com/strategy/paris-boom-xb-1-schedu...
Overture is a production model for commercial operations.