This shortcut allows you to set reminders to let you know when your device has charged to a specified level. For example, if you need a quick 30% charge on your AirPods Pro flat battery use this and get notified when it’s done.
You can also add your own devices to the list such as your Switch, laptop or anything else that you know the timings for charging.
Visit https://www.smallbites.me/shortcut-timers-to-charge-your-devices/ for full details on how to make this shortcut work for you.