AsPresident Trumpdescribed them (viaTime): “They are massive ships.
The big white ships with the red cross on the side.
One is called Mercy and the other is called Comfort.”

He added the additional reassurance that “they are in tip-top shape.”
That enough info for you?
For any details more specific than that, though, we’ll have to turn to other sources.

How the floating hospitals will help with the coronavirus epidemic
The U.S.
The ships will, instead, be used to provide relief for local hospitals.
Of the two ships,CNNreports that the USNSMercyis the one that is closest to being ready.