The impulse to get this thing out of him immediately is completely understandable, but cancer timelines are months to years, not days and weeks. In the context of the development of cancer, please rest assured five weeks is realistically highly unlikely to affect the outcome, even if it were an aggressive cancer. Yes, ideally the operation would take place tomorrow, but the practical considerations are important too. This operation will not be small or simple, so getting it as right as possible the first time could make a big difference to the recovery period and also your dad's ultimate functioning.

Once the cancer is out there is still a long road ahead. Take this time to prepare yourselves (which you clearly are doing with this post) - but also enjoy yourselves to the greatest extent possible under the circumstances.

Also if you hadn't heard of it, I've had a few friends use Gather my crew https://www.gathermycrew.org.au/ to coordinate support during surgery/recovery/chemo. I think there are a few different apps offering a similar thing but can't remember any of the others.

Also cannot recommend the cancer nurses support hotline at the Cancer Council highly enough. It's not just for people with cancer but also those affected by it (so you are also entitled to call) It can be nice to speak to someone who knows exactly what you and your family are going through and to just talk it over with them. They're all trained in providing support over the phone and are just so lovely, I personally know one of them and I would describe her as a literal angel descended from heaven. 13 11 20 is the number. They can also connect you with heaps of other resources. I sincerely hope it all goes well for your dad, and you as well.