When Boris Johnson had COVID-19, he was working from home with mild symptoms until the 8th day after his diagnosis, at which point his condition worsened so much he went into the ICU. For comparison, Trump first had symptoms 4 days ago.
The course of this disease is unpredictable. Maybe he is over it now and will be fine. Maybe the experimental treatments he only has access to because of his position were sufficient. But it is really too early to say anything.
Anyway please don't take advice about the proper attitude toward the pandemic from someone who is in the early stages of infection, has access to every possible treatment at a moment's notice, whose image depends on projecting strength, & who may or may not be heavily medicated.