If you need a Covid test to exit the BVI, IMO there is no better place than Great Harbor at JVD. Make an appointment via email (or in person if passing through earlier). Dinghy ashore for the test between 7:00 and 8:30, walk to the clinic tent behind the church with no roof, pay (cash or credit card), done in 5 minutes, back to the boat, results emailed by noon the next day.