I made the 9 grand yesterday because that is when I received the money. Only a fool says they made 9 grand before the cash is in hand. What do you do if before you get paid the guy holding your money gets robbed, or dies?
My accountant spent a bit of time pounding that into my head several decades ago. His son is still my accountant to this day.
You don't mail cash, son. You pick cash up in person.