A follow up to this journal: https://www.weasyl.com/journal/134271/important-please-help
So, my cat's surgery went well. About a week later I got the results of his biopsy. The cancer was a low grade and unlikely to have metastasized anywhere. I have to keep vigilant for any more lumps, but he should be cancer free! His stitches came out yesterday, and he's healing super well. Everything went as well as it could and I am so happy that my little furbaby is okay.
I am still open for commissions/donations to help with the bill, as it was on the high end of the quoted estimate. Anything helps!