I have created an app that checks the App store for updates to all the apps installed on Homey.
There is an option to Notify on the Timeline once per day of any updated apps or you can check manually whenever you want. The app configuration page will show a list of app updates along with buttons to go to the relevant app page in the store so the update can be installed. Updates are detected in both the release and test channels.
The app is available on GitHub (https://github.com/AdyRock/com.community.store) and can be loaded via the CLI (see [HOW TO] CLI install method)
You can also install this via the Community Store https://homey.community/ which is much easier.