The Apple Pencil 2 doesn’t have a physical charge indicator or LED light. You check its current battery life on the iPad Pro to which it’s paired.
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Swipe down from the iPad’s top bezel to call up the Notification Center.
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Swipe right to see the Widgets screen.
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View the Batteries section.
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If you don’t see the Batteries section, tap Edit at the bottom of the Widgets area and tap the green “+” button next to Batteries to add it as an active widget.
(This how-to is based on my experiences and info on Apple’s support pages — where the images sometimes come from.)