When does the money show up?

The day they pay, the commission appears on your Ambassador tab as pending. It becomes available when the refund window on that payment has closed: 120 days for somebody's first payment, 30 days for each renewal.

Why the wait

A card payment can be disputed or refunded for a while after it is made. Paying out before that window closes would mean taking money back later, which is worse for everyone. The first payment carries the longest window because that is when disputes happen.

Reading the bar

Pending is earned and waiting. Available is yours to take. Paid out is what has already gone to your Pro credit or your bank.