Once again this has everything to do as to when the deed will actually change hands.
If this will happen in 2022 then you report the entire sale in 2022.
What you have right now sounds like a "rent to own" situation on which you should have an attorney approved contract in place and the "down payment" along with any other "rent to own" payments should be placed in a trust account (AKA an escrow account ) in case the sale falls thru.
