Showbie has been working on converting the web app into a Progressive Web App (PWA). Showbie still works the same way as before but there are changes and improvements behind the scenes that allows a lot of opportunity for future enhancements.
With the PWA, enabling push notifications on your device will be supported. Keep in mind, you'll also need to enable push notifications on your device to receive push notifications. Once done, follow these links on how to enable push notifications:
Note that you must ensure the browser itself has notifications turned on at the OS level, otherwise notifications will automatically be blocked.
The PWA features work on all major platforms: Mac, Windows, Android, but notably not iOS currently. Chrome and Edge lead the way but Firefox also supports these features pretty well.