The number of updates appears next to App Store in the menu.
To get your updates, click App Store.
After App Store opens, click Updates in the sidebar to see available updates in the App Store.
If you receive a notification that an app update is available, click Install. (Or click Close to dismiss the notification.)
You can automatically download and install app updates.
Go to the App Store app View, redownload and manage apps in the App Store on Mac