Try to have them in before January 31st, I do think I remember reading something that said that you had to have taken your SAT/ACT in December/January and that if you took them before January 31st it's okay if the scores make it there a little late.
Here's a quote from the website:
"We will accept any ACT or SAT test that is taken before the January 31 application deadline, even if the results arrive after January 31. "