This actually isn't quite right unless you are living in Arizona. But I think you live in Colorado. In that case, the proper time zone is "Mountain Standard Time". What you have works now, but would not work correctly once back on Daylights Savings. US Mountain Standard Time is for AZ, which does not observe DST. Similar case with Eastern Standard Time and US Eastern Standard Time. The latter is to accommodate for Indiana, which didn't observe DST until about a decade ago. The time zone functions actually know all this.
The time zone improvements are one of my favorite 2016 new features. However, I wish Microsoft in this case would have used "Mountain Time" to represent the DST moving time zone and "Mountain Standard Time" to indicate that it doesn't move. I find the Mountain Standard Time vs US Mountain Standard Time to be less clear.