I'd think for Harvard of all schools SAT probably doesn't matter much today. Their range is 1460-1580 with a mean of 1520. Broadly speaking, the test is too "easy" (especially for the class Harvard admits) - over 25% of enrolled students are pulling an 800 on math. And needless to say, Harvard will reject plenty of students getting perfect scores.

I imagine SAT provides little signal at Harvard conditioned on GPA, APs, and other extracurricular demonstrations of academic merit.