This one of the things activity tracking devices are good at. The Apple watch has a "stand" metric, but what it's really trying to measure is if you get to N level of movement during each hour. Standing in place won't cut it. I've only ever tried the watch, but other trackers like the Jawbone, I believe should do the same thing.
The thing is, properly used sit-stand desks give people much more freedom to change their position as desired. I recently got a sit-stand desk, and it is easier to move around if I'm already standing. It's only been a couple weeks, so we'll see.