As of April 2021, the CDC "unvaccinated" definition includes people who are thirteen days after their second vaccine, https://www.cms.gov/files/document/qso-20-38-nh.pdf

> Fully vaccinated” refers to a person who is ≥2 weeks following receipt of the second dose in a 2-dose series, or ≥2 weeks following receipt of one dose of a single-dose vaccine. “Unvaccinated” refers to a person who does not fit the definition of “fully vaccinated,” including people whose vaccination status is not known