How did James Baker know Bush was going to die that day? From USA Today. Baker recounts conversation with Bush on the day he died.

"He said, 'Hey, Bake, where are we going today?' and I said, 'Well, jefe, we're going to heaven,' " Baker recounted. "And he said, 'Good. That's where I want to go.' "

https://www.usatoday.com/story/news/nation/2018/12/02/george-h-w-bush-last-day-last-words/2182864002/