How To Install a Progressive Web App (PWA) on iOS and iPhone
https://webappsunlimited.com
After you have downloaded the App and it is showing on your device, Tap the Share button (on the browser options).
From the options, tap the 'Add to Homescreen' option, you will notice an icon of the website or screenshot of website added to your devices Home Screen instantly.
Tap the icon from Home Screen, then the Progressive Web App will be loaded.
Navigate some of the App's pages to test.
Now close the web app.
Now you can find the Installed App on your Home Screen.
Tap and start Ordering.