I would have your student do a few practice tests to see how they do on the SAT and/or ACT. If they are good test takers, I would be inclined to have the student study for and take the test in August/September. If you don’t get a good score, don’t send them. If you have a solid score, then you can send. Better to be safe than sorry.
Most colleges, especially holistic ones, will review what is submitted to them in the application so I think that having a “good” test score can help confirm you have the intellect to do well at that college. You can bet that many juniors will have taken the SAT/ACT prior to March 2020 and will be submitting their high scores even if colleges are test optional.