Large visible hard lump size golf ball above belly button and fluid build up. Should I massage?

What you describe is consistent with a seroma or possibly even a hematoma. If this is the case it's best treated by aspiration.

It is difficult to tell you the cause of the lump without a proper exam but I think you are on the right track booking an appointment with your surgeon as soon as the office opens.  If there are concerning changes you could seek medical attention sooner, for example in the ER.

You definitely want to make an appointment to see your PS. It sounds like you have a hematoma and/or seroma. You want your compression garment to be tight. Massaging can help if the lump is fat necrosis, scar, or hematoma.