According to the CDC, you are considered fully vaccinated:
2 weeks after your 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
To receive the most protection from the vaccine, you should receive all the recommended doses.
You will want to talk to your health care provider if you have a condition or taking medications that weaken your immune system as you may not be fully protected even if you are fully vaccinated.
The CDC recommends fully vaccinated people wear a mask in public indoor areas of substantial or high transmission to maximize protection from being infected with the Delta variant and potentially spreading it to others.
The CDC COVID-19 Data Tracker is a tool to determine the level of COVID-19 transmission in communities throughout the U.S.
For more information about vaccines, visit the CDC.