Glad to hear the surgery went well. As others have said, you can't really anticipate what the pathology report will say but all indications are your dad should get a good report. It looks like his cancer was caught early.
Right now he just needs to concentrate on getting well and recovering from surgery. One of the most important parts of that recovery is a good support group. It looks like he has that with all the good support you and hopefully others are giving him.
Please pass on our best regards from the healing well folks and we'll look forward to hearing good reports. David