At the Maho location in the plaza level of La Terrasse, it has been 8am - 10am.. it is directly across the road from the Sonesta Resort.

They were offering no testing on Sundays at that location.
What I would suggest is if you are in the area any morning during the week while you are there you physically go there and they will tell you what the times are for the testing. That way you know for certain.

I went down a couple weeks ago at 8:30 a.m.. because I am Canadian and because the rules had not changed yet I required a PCR test which took only a few minutes. Now Canadians only require the rapid antigen test the day before you travel.

Hope that helps.

Drphilsxm