Apple said the percentage is accurate, but because of the dynamic ways we use the computer, the time remaining indicator couldn't accurately keep up with what users were doing.
From a report on The Loop: You can still see the image on the top of the screen, and you can see the percentage, but you will no longer be able to see how much time is remaining before your battery dies. Apple says it stands by its 10-hour battery life claim in the new MacBook Pro models, and adds that the battery life indicator didn't show accurate information. Apple has removed the 'time remaining' battery life indicator with the new macOS Sierra update following complaints from several users of new MacBook Pro models.
