USNA Application

I am currently a junior in high school. I decided that the USNA is the best place for me earlier this year. Due to COVID-19 cancellations of SAT tests I have not yet taken the SAT or the ACT. Should I submit my preliminary application now, or should I wait until I can take the SAT later in the fall of this year before doing so?

All applicants are under the same constraints. You should get your questions answered from the source. From the USNA website (Admissions/Coronavirus Update):

BTW, that’s a good answer to almost any question about academy admissions: read the entire admissions web site, and if you still can’t find your answer then ask your admissions staffer. The internet might “know” things, but it could be from another time, another academy, or just wrong. Go to the source.