Install If You Use AOD
If you use Always on Display (AOD), you'll probably want to install Android Pie because there are some nice upgrades on board.
On Android Oreo, you can either have AOD turned on all the time or schedule set times. This has changed with the arrival of Android Pie.
The Pie update brings a "Tap to Show" function that makes it even easier to wake your device up a nap.
When "Tap to Show" is active, you can simply double tap the display to bring up all of your information (time, date, battery life, etc). This information from will be displayed for 30 seconds giving you on-demand access.
Android Pie also brings new clock styles including one that shows your calendar with your schedule as well as charging information.
The charging info will let you know how much time is remaining until the device is fully charged.