I would assume that it says on their website/application, something along the lines of all packets must be in the office by X date or must have a postmark of X date. Use that as your guideline.
Traditionally that means anything after will not be in their files, including your ACTs.
I would recommend you call Tuesday and speak to a staff member to guarantee they do indeed have everything required. You never want to assume that they got it, nor that you didn't by accident forget to submit something.
As for how long it takes them to whittle down the files, it depends on how large the pool is for this year. DS had to submit to his Congressmen Sept 30th and did not hear that he got the nomination until Jan. 31st. There are others that hear back within a month.