When I recieve a "Reservation Confirmed - (Guest Name)" e-mail, I assume that this reservation is confirmed because the guest has paid (Airbnb) for their stay.
Airbnb will pay me what I'm owed once this guest checks-in. I usually get an email from Airbnb the day after check in "Payout of $00000 sent" and the money shows up in my bank account 3~4 days after I get the payout notification email.