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This is the time for him to write his will/living trust and take serious steps towards planning his funeral and final resting place. Not an "I want to be buried in a hole in the ground," but actually picking the mortuary, buying the graveyard plot, and selecting the gravestone design that will be used should he pass away.

If he is the sole living partner, he also needs to begin handing out things not covered by his will/living trust to remaining family and friends. "Here son, take my fishing rod. It's yours now." For the sake of his soon-to-be-grieving-should-the-cancer-proves-to-be-terminal family and friends, he also needs to get rid of his useless junk. He needs to get rid of that stool that he kept around for no reason instead of having family and friends argue over whether they should get rid of the stool because since he hasn't gotten rid of the stool, this stool obviously has great sentimental value to him.

He shouldn't wait until he has terminal cancer before going, "Welp, I'm gonna die. Time to settle my affairs." He's going to die anyways just like how we're all going to die as well. If the cancer becomes that advance, he's going to be very weak and in constant pain, perhaps not even mentally competent enough to make important decisions. And even if he does beat cancer, he's going to be frailer than he is right now on top of being weaker due to being older.

However, everything I've read about him from you paints him as a typical boomer dude. I do not think he will take my advice to heart. Most likely, he will deny that he is very close to the edge between life and death and has to be dragged kicking and screaming to seriously reckon with his mortality and take appropriate actions.