Thanks for reaching out!
That lens will definitely get you the shots you need from 60' away. You'll probably end up around 250mm for a medium (waist up) shot.
If you just plan on using that as a medium shot and will only be panning/tilting to follow people on stage, then that lens will work very well for that. However, just keep in mind that it is manual zoom only so you won't be able to do smooth servo (motorized) zooms with it without using a third-party external zoom servo motor.