See https://www.irs.gov/payments/payment-plans-installment-agreements. You probably want the FAQ for "how do I review my payment plan?"
according to the FAQ you're supposed to get "immediate notification". Did you supply an email address ?
Yes I received an email stating filing was accepted. When should I get something in the mail from irs to start making payments?
the notification about the payment plan is separate. The on line status is closed right now. Review your status there when it reopens.