Hey Nate,
“After the order is completed, you receive full payment for the order upfront, excluding the fee incurred for using Shop Pay Installments.”
https://help.shopify.com/en/manual/payments/shop-pay-installments
You wouldn’t receive 100% of the total order cost (as there are fees that are deducted), but you would receive the full payout (you wouldn’t have to wait until all payments are made to receive the money).