As a general rule, MSI is not available on the weekends. However, they've been very understanding about that kind of stuff with relation to deadlines. Also, if you are doing one of the targeted shops, those don't repeat the next week. The target reps travel, so they only know their schedule a short time in advance. So it's good you got approved and had a successful shop!
There are other targeted shops that pop up at other nearby locations for me, so if they don't approve one in time, there's always the next one.
Lastly, if you haven't put in your EIN, they will be contacting you about that. I got about 5-6 phone calls on that matter alone when I first signed up, and during that period the government site was down and I couldn't get one. They take confirming your identity very seriously, and you may not get paid until it is confirmed.