The analyst of Informa Economics estimated the U.S. winter wheat production 2016 to 1,564 billion bushels. The entire US wheat production forecast information to 2,217 billion bushels.
U.S. corn production: 14,531 billion bushels with yields 167.9 bushels/acre
U.S. soybean production: 3.89 billion bushels with yields 46.9 bushels/acre
You can find the last estimate of the US Department of agriculture from 11 June to wheat, corn and soybean production here!