With 583 still available, that is 48.88% (49% of the remaining delegates. Very doable indeed.
Especially if Trump keeps cheating by winning those winner-take-all states.
(It cracked me up to see Cruzers suggest that winning winner-take-all states is somehow akin to the kind of shenanigans that Cruz has been doing in Colorado, etc.)
Vert doable because NJ is a guarantee winner take all!
So, the percentage of remaining delegates needed is a lot less.