He's home now, resting, and getting back into the swing of 'being retired'.
The surgery was a success, they removed 5% of one of his kidneys, and completely removed the tumor. There will be no chemo and nothing else besides standard followups to make sure he's healing.
Praise God that his back was hurting him enough to get him to go in for xrays. They never figured out what the back pain was, but by the grace of God they found the tumor, tiny and easily cut out before it caused any real damage.
Glad to have my old man still around. I may be a father of 2 myself, but there's always something he can teach me.