By Mel Miller The Cowboys lost 27-22 at Atlanta and Dallas quarterback Dak Prescott will undergo an MRI today to determine the severity of his injury which owner and general manager Jerry Jones called a “high hamstring” injury. “I mean, it’s hard for me to say. I would say that I’ll be out there next week,” Prescott said of the Cowboys’ Week 10 meeting vs. the Eagles at AT&T Stadium on Nov. 10. “Once again, I’ve got to see. Luckily, I can say I’ve healed fast, I’ve progressed fast on injuries and things, so thankful for that. Got to get…..