He went into surgery at 12:50PM EDT. They expect that he'll be in ICU overnight, and longer if the surgery requires.
Please pray that he loses as little of his lung as is required for the cancer, and that it hasn't spread.
Update: 9/12 21:50: My grandfather is resting comfortably (albeit a bit groggy from the pain medicine). They removed the upper lobe of his right lung (about 40% of the lung), but as long as the lymph nodes are clear they will not recommend any chemotherapy.