Our app is ready so we can publish it as a Progressive Web App.
It's as simple as running flutter build web and publishing the \build\web output folder. You may want to edit the index.html and customize it to your needs, such as changing meta data, <title>, favicons and PWA manifest.json declaration (including updating the icons from the assets).
See Learn PWA! for more details and insights about Progressive Web Apps; it's a free interactive ebook that I published on this topic :) Also, you have great PWA courses at Frontend Masters, including my workshop Build Progressive Web Apps (PWAs) from Scratch