This week, the Biden administration is set to announce a requirement for federal workers to be vaccinated or submit to strict safety measures and regular testing. On Tuesday, the CDC reversed its guidance on wearing masks indoors, that same day the President Biden said a vaccination mandate for all federal employees was under consideration. Biden is set to announce these new rules on Thursday, but it is unclear when the changes will go into effect.
See "Biden administration to require vaccination or regular testing for federal workers", Kevin Breuninger, CNBC, July 28, 2021