It’s still work in progress yet KDE developer,
This means you’d be able to get rid of the annoying habit of turning on your smartphone’s screen every so often in order to check its battery status.
Since the feature is still in its early stages though, Kai warns us not to expect it to land in the upcoming Plasma 5.3 release.
However, since its prerequisites had already been pushed into Plasma, it’s possible that the backend will be added later on, decoupled from Plasma.
On a side note, if you are unfamiliar with KDE-Connect, perhaps this is a good chance to introduce it to you, basically you can sum up what it is by understanding its purpose, which is:
KDE-Connect wants to make your computer aware and seamless integrated with all your devices, to simplify your daily tasks.
Certainly, a good place to start would be integrating KDE with your smartphone and the sooner it happens – the better.