Have you tried PowerPoint's Presenter Coach?

If you haven't heard of, or used, Presenter Coach you are going to love it!  It is a way for you and your students to get feedback on your presentations.  It will give you feedback regarding your pacing, use of filler works such as like and um, use of culturally sensitive terms and if you are reading for the slides.  At the end you will get a report that tells you how long your presentation is, statistics on what you said and suggestions on how to improve.

Watch the video below to see it in action.

So now that you know what it is, let's get you using it!  Right now it's only available on PowerPoint for the web.  Once you sign in (either with a personal, work or school account) click on the Slide Show tab and select Rehearse with Coach.

When you are ready, click on Get Started and then start talking.  That's it!  You'll see some suggestions in the lower right of your screen and when you are done a summary report appears.  One thing to note is that it doesn't save the report, so you'll have to take a screenshot of it if you want a copy to refer to later.

image source: https://support.office.com/en-us/article/Rehearse-your-slide-show-with-Presenter-Coach-cd7fc941-5c3b-498c-a225-83ef3f64f07b