In limbo- MRI Dec 19, CT Dec 30. Only info is that it’s at least 6cm

Hi-
I’m an accident- at least that’s how they described it. I had an MRI on December 19th due to a back injury. My birthday is December 21, and with the holidays along with what I thought was going to be the same old result, (yes your back is still injured and yes we did in fact remove three disks) the NP ordered a CT scan with contrast. Again, I had no suspicion other than “typical insurance, instead of just doing this all at once, they have to step through all of these hoops.” I was lucky (I thought) and scheduled the ct for December 30th. By chance my son had called and I couldn’t answer my cell. When I had time to call, I noticed several calls from my pain NP. I opened the most recent one and heard “you have a mass on your kidney that is at least 6cm. I ordered a ct scan of your abdomen. It is likely cancer.” A bit about myself. Cancer isn’t new to me. My daughter (24) has thyroid, my father had three genetically different tumors meaning he didn’t have mets, he literally had three primary cancers and died from the third. 2 Aunts had lung cancer and died, my sister has thyroid, my FIL has bladder, and a cousin had a very rare type of bone cancer that presents itself on the top of the spine near the brain stem. I had already assumed a foregone conclusion that I would have cancer, but I didn’t expect it to be caught accidentally. That brings me to my point. It is large as kidney cancer goes, my primary doctor provided the information that it is likely stage I and will probably require the removal of my kidney. Meanwhile, getting anyone who actually deals with kidney cancer to look at the CT and MRI is next to impossible, and besides what my PC provided, I have no other information. I purposefully have not researched this other than chat GPT to provide me advice on how to talk to loved ones and providers, but I am concerned that the size alone is an issue. One main concern is what is the next step? Will I need a biopsy or will the surgeon just go ahead and remove the mass? I have a choice (I believe) between UC Davis and Stanford both of which have an outstanding surgeon and latest techniques. I could go to the Mayo in Phoenix but I would prefer to remain closer to my treatment team. Any thoughts? Anyone else have a stage I tumor that was 6cm plus? How worried should I be and how quickly should I get the thing removed?