There is a high degree of population immunity against COVID-19. More than 98% of the U.S. population now has some degree of protective immunity against COVID-19 from vaccination, prior infection, or both.
Under the "Executive summary" section on their updated guidelines: https://www.cdc.gov/respiratory-viruses/background/index.html.
They still haven't dropped the jab mandates for my wife though: https://www.cdc.gov/immigrantrefugeehealth/panel-physicians/vaccinations.html#covid-19-vaccination
I guess because they can! Lawsuit?