Usually it's handy to activate the battery indicator in percent in the status bar of Google Pixel 3. This allows you to see very quickly how much battery charge is still available and when the device is about to be charged.
If the percentage display on your Google Pixel 3 is not visible, please proceed as follows:
Activating or deactivating the battery indicator in percent
First, navigate to the "Settings" menu of your Google Pixel 3 by dragging down the notification screen and tapping the gear icon.
Search and select "Battery". The option should be at the bottom of the settings list.
Now activate the option "Battery display in percent" - Done!
Now you can always see directly in the status bar how much battery is left in percent. This is useful but has the disadvantage that it takes up more space.