Have a look at deConz Addon - deConz Firmware integration sensor for this. Latest version is grabbed from GitHub, current version in my case is grabbed from /config/.storage/core.device_registry. Add an update sensor comparing installed and latest version, use multiple-entity-row (or anything else suitable to individual taste) to add in in the UI and add an automation to get notified as soon as there´s an stable update available.
…but as we can see: when using deCONZ addon we need to wait for THAT update anyway.
By the way: please anyone vote vor Ability to use deconz beta version 
Thanks 