Like everyone else, I'm so very sorry, OP. My dad died two years ago. We had a rough relationship though I loved him in spite of all the stupid drama. I wanted to clear the air and, he had multiple strokes too, couldn't speak anymore. When Hospice told us the end was near, I sat next to his bed, as you are, and said the following four things.

I love you, Dad, I always have.

Thank you for everything you did for me, I know you did your best and I am so grateful to have as a father.

I forgive you for anything that happened in the past.

Please forgive me for any hurt I caused you. I never meant any of it and only have love for you.

I placed my head on his chest as he struggled, desperately, to breath. It's as bad as it gets, I'm so sorry for you, but please do speak to her. Two years out, I feel free because I talked to my dad from my heart and believe that he heard me, that we had a real connection at the end. Finally.