where do I find yield data on the master farmer traited corn Glyphosate tolerant?

We do not have trial plot data available for Master Farmer products. With that being said, you should be able to get an idea on performance through FBN Seed Finder! 2019 harvest results should soon start trickling in from the south, but in the meantime you can look in Seed Finder to see how Master Farmer products have performed in other brands. Much of the Master Farmer lineup is relabeled, so you should be able to search for the product, find a relabeled hybrid, and then see yield data on that relabeled hybrid.