I'd put the odds he ends up in the hospital within a week at better than 75%.
I expected him to be admitted within 6 days...not 6 hours of when I posted this!
He is seriously, seriously ill. He's going to be in the hospital for a long time.
Don't be fooled by the photo-ops of him signing a blank sheet of paper, or even his joyride to wave at the Proud Boys hanging around outside the hospital. One of the immediate but short-term side-effects of the heavy corticosteroids he's taking is a burst of energy, even euphoria. He'll have crashed by Sunday night. That pattern may repeat this week - videos and messages of "hey I'm feeling great" during the day, frightening crashes in the evening.
He may recover - it's far from settled, but he is of course going to get the best medical care humanly possible. The question is, can even the world's best doctors compensate for his serious comorbidities such as age, obesity, high blood pressure, etc.? By the end of the week I expect we will have at least a somewhat clearer picture.