A PWA is just a website with a bunch of extra metadata to help various platforms make it "feel" closer to a native app. But it is just a web app - it needs to be hosted via a web server just like any other regular TMS WEB Core app. Miletus and Electron projects will generate a local executable that you can run without a webserver - there's one built into those applications. That's not the case with PWA apps.
From the website that hosts the PWA, it walks and talks just like a regular website. To "install" it on Android or any other platform you'd visit the website with that platform's browser and then use the "add to home screen" or equivalent to then add an icon that looks like a regular native app.