What is the free PCR test of which you speak?
COVID-19: Express Testing - NYC Health
www1.nyc.gov
Turn around time is really fast, 3 to 4 hours in my experience, sometimes up to 6. They currently running Cepheid testing that also includes influenza a and B and RSV. Appointments are available 3 days before date of testing, I recommend getting on the site at midnight to get your appointment, although there isn't that high a demand anymore now.