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Notification Center on your Mac
Use Notification Center to view details about your day (calendar, stocks, weather, and more) and catch up on notifications you might have missed (email, reminders, app notifications, and more).
Open Notification Center. Click the Notification Center icon 
at the top right of the screen. Click Today to see what’s coming up or Notifications to review what’s come in.
Silence notifications. Open Notification Center, scroll up, then turn on Do Not Disturb. You won’t see or hear notifications as they arrive, but you can view them later in Notification Center.
Learn more. See the Apple Support article Use Notifications on your Mac.