The "official" reports on Trump's condition / prognosis are horse sh*t - it doesn't add up.
If he's sick enough to warrant use of steroids (dexamethasone) now, then that's fast - he's probably at about day 6 from infection, only a few days from developing symptoms (which were either severe enough to warrant oxygen - or they just put him on oxygen anyway).
If he is going to get really unwell then that's probably not going to happen for days.