Literally that is the CDC definition:

In general, people are considered fully vaccinated: 2 weeks after their second dose in a 2-dose series, such as the Pfizer or Moderna vaccines, or 2 weeks after a single-dose vaccine, such as Johnson & Johnson’s Janssen vaccine

https://www.cdc.gov/coronavirus/2019-ncov/vaccines/fully-vaccinated.html

Literally that is the CDC definition:

*In general, people are considered fully vaccinated:

2 weeks after their second dose in a 2-dose series, such as the Pfizer or Moderna vaccines, or 2 weeks after a single-dose vaccine, such as Johnson & Johnson’s Janssen vaccine*

https://www.cdc.gov/coronavirus/2019-ncov/vaccines/fully-vaccinated.html