How do you know your Apple Watch 6 is finished charging?

Hello! Typically your Apple Watch is done charging when the circle with the lightning bolt is full. This circle should be visible in nightstand mode on the left side of your Watch's display.

If you would like to check your Apple Watch battery through different methods, however, you can refer to the information here: https://support.apple.com/en-us/HT204608.

Swipe up on the watch face and you will see the battery charged percentage number.