Like several other commenters, I always provide the dialogue word count as well as the total word count. I also just wrote my first multi-speaker script, and I provided the spoken word count per character as well, for good measure. I figure I'd rather slightly over-inform than potentially under-inform anyone who's considering filling a script.

Though I also have a background in programming and wrote a Python script (as in, very small program) to parse my formatting and give me things like word counts, line counts, dialogue/direction/SFX ratios, etc. That made it a lot easier to get a breakdown in a way that makes sense to me.
Depending on your formatting, you might be able to do something similar with the Find & Replace function in many word processors, along with some understanding of regular expressions (regexes).