Word count of highlighted passage?

In one morning, I go back and forth between my laptop at my treadmill desk and my desktop at my regular desk. I have to close my binder to open on the other machine, which means I lose my day’s total word count, which makes it tough to keep track of hitting my daily goal. I’ve done a search, and can’t figure out how to get a word count for only a highlighted passage. I’ve been copying the text into a Word document to see where I am.

Am I missing something obvious? Help?

Right-click on the highlighted text and look at the bottom of the pop-up menu.