I wouldn't say that was the last stage by any means. We went through a lot more stages after that (but everyone is different).. and I would say what you're seeing now is the 'most' difficult stage to handle. The last stage for me and Dad was him being unable to move and bedridden, having to use a hoist, a special support chair and a hospital bed.
But I will never ever forget the words of my Dad while he was still able to speak and string a sentence together... He said... 'I don't know what I would do without you'.
So I was with him until the end,
because I was able to and because I was very lucky
If you think of the end as the end of your ability, then feel good about making sure he's in the best possible place where they can carry on your good work, you did everything possible you could do. Then you can see him being looked after with your mind at ease