How long do USACO results take to come back?

I’m a rising senior who is planning to participate in USACO this year. The first contest takes place in mid-December — right before the RD application due date for a majority of colleges.

Can anybody shed some light on how this competition works? Will I know if I have been promoted to USACO silver before RD applications are due?

I’m planning to apply early to Harvard (computer science). Although I cannot put USACO on my Harvard application, I think that USACO would indicate my CS interest on other applications.

Competition goes from Friday-Monday. A few days will pass and cutoffs will be released; usually this happens on Thursday or Friday the same week iirc. You will be automatically promoted if you meet the cutoff and your name will be on the list. Do you have any experience with competitive programming?