Nope. There are not.
At this point, there are about 905.
I think this is a fair assessment of the situation:
http://www.al.com/news/index.ssf/2016/03/presidential_primary_schedule.html
Trump currently has 678 delegates, 559 short of the number needed for the nomination. His closest rival, Texas Sen. Ted Cruz, has 413 and Ohio Gov. John Kasich has 143. About 60 percent of all Republican delegates have been awarded so far, with Trump winning 47 percent of those. If that pace continues, Trump could end up about 100 delegates short of the 1,237 needed at the convention. To win the nomination outright, Trump needs to win more than 60 percent of the remaining delegates.