Congrats on the sale!
You will receive a notification of your first payout being approved within 1-2 business days following the delivery of the item according to the tracking information you've provided to Reverb.
Following that, it may take your bank 1-3 business days to process that deposit and for the funds to show up in your account.
Further Reading:
How Long Does it Take to Receive my Payout?
I Don't See My Payout, What Are The Next Steps?
My Payout Has Been Approved. What Does That Mean?