Key parts of the Progressive Web Apps platform, such as Service Workers, require using HTTPS. When your PWA goes live, you must publish it to an HTTPS URL. Many hosts now offer HTTPS by default, but if your host doesn't, Let's Encrypt offers a free alternative for creating the necessary certificates.
If your PWA setup is complete, you can use
PWA Builder to generate app file for Microsoft Store, Google Play Store and iOS App Store if you would like to upload your app.