While I don't really believe in a "Finished MVP" (I don't think I even believe in a fully "finished" anything), I had enough of a product by May of 2019 to partially replace (high school administrators are much too attached to their paper) the previously paper-based peer tutoring management system at my high school.
Now, for any curious developers, I have a few confessions to make (confessions that I feel comfortable making given that our web app has seen considerable improvements since May of 2019):
Most of that initial MVP was just a re-themed version of Google's FriendlyEats Codelab. I literally grabbed that project's source code, changed the theming, edited some of the web app's text, and deployed my "MVP" to Firebase Hosting.
Admittedly, I did have to implement a considerable number of changes before my app could actually be used to coordinate peer tutoring; but it did start out essentially as the FriendlyEats for tutoring.
For those first couple of months, the URL that I, and the school, had to point people to was https://tutorbook-779d8.firebaseapp.com/app. Not ideal. But it worked and my customer, the school, was happy (probably because they weren't expecting much from a high school student in the first place).