Apple removed the “Time Remaining” battery indicator from macOS. This indicator gave an always-updating time of battery life remaining. Good news though, that’s still pretty easy to check.
Depending on how often you used this feature, you have a few different options for ways to check the “time remaining” on a battery. For a native option, you can easily take a look at that estimate by opening Activity Monitor, then clicking the Energy tab. At the bottom of the app you’ll see an “Estimated Time Remaining” indicator.