The Cydia Tweak Vettr has been officially released and works with devices that have iOS 9 or higher. Vettr is a new cydia tweak brings clock and battery level indicator when the device is locked and plugged into a charger. Normally iPhone or iPad’s screen is turned off when it is charging, however this tweak puts a clock on it. The charging indicator is useful too as you can see how much the battery has charged from a distance and without pressing any button.
If you’re in to give this tweak a try, Vettr jailbreak tweak is available for free from BigBoss repo. Simply install the tweak on your device and configure it the way you want to use it from the preference pane which you can access from Settings app and then you are ready to make the best use of it. To install this program requires a jailbroken device (see if and how you can do the jailbreak to your iPhone by clicking here) and you need an Internet connection to download the package.