My dad might have rectal cancer

Hey so! he was constipated for 2 months and he used to put massive strain everytime he wanted to poop and once he saw blood in his stool so we took him to the doctor he asked us to get blood tests colonoscopy and CT scan done. Which we did
and a large nodular ulceltrated mass was found in lower rectum rest everything else is clear. He didn’t have any other symptoms other than constipation
Biopsy report is awaited but seasoned doctors are saying its 90 percent cancer. We got MRI done as well.
Ik its difficult for my dad obviously but its particularly difficult for me as a daughter. My dad’s career never took off so i’ve been managing the family and its entire burden since i was 22. He had also gotten covid in 2020 and i got him treated for that and it took away 8 months of my life and now idk this cancer how long will the treatment go on and its a time in my career at 27 where i need to solidify it so that my family doesn’t see any financial troubles again. But i don’t think god will give me that chance. Since idk how many months will go into treating my dad.

I’m losing hope and turning bitter. Please guide me