Hi everyone, did a search but did not find an answer.

I am staying at a Residence Inn for 90 days begining today on business. I currently have no status with Marriott and am wondering if I will only get the nights credited to my account once I have checked out in September or if the will just increase as the weeks go by. This will make a difference in the number of total points I would get in the end once the bill is paid, due to bonuses. If the nights only are added at the end then I am considering getting the Marriott Visa card so that I am at least silver and get the 20% bonus points. Thanks for any advice.