Ways to manage capital gain
You want to sell the 3 parcels separately I take it.
Is that because you can't get a buyer for it all at once?
If you sell it all together, you and your wife can exclude up to $500K in capital gains. As to the balance, you will need to pay capital gains tax on it, or do a structured sale for part or all of the proceeds and receive periodic payments. You can defer the start of the payments until you are retired and presumably in a lower tax bracket.
If you can't sell it all at once, divide up the parcels. The same advice as above applies to the parcel your house sits on. As to the other 2, you can do "1031 exchange" where you exchange this property for other investment property through an intermediary. This defers recognition of the gain indefinitely until you sell the last property in the continuum.
Or you can do a structured sale of the other parcels, and convert part or all of your proceeds into periodic payments through a "structured sale." Then you wouldn't pay any tax on any of the gain until you receive a payment, and then only on the proportionate part of the payment which represents gain. Your payments can be 1 or many, monthly , quarterly, annual, whatever. They can start now or later. You can choose to get payments to last your whole lifetime, sort of like a pension from your investments.