If you've been getting emails super late on Monday, don't panic. Gmail is experiencing some service issues, and expects that they should be resolved soon.
The main outage happened around 2:05 P.M., and less than half of users experienced email delays, according to Google.
The outage is over, but there is currently a "service disruption," and Google says that the disruption should end within an hour.
UPDATE: Finally, at 10 p.m. EST, the issue was resolved. "We apologize for the inconvenience and thank you for your patience and continued support," Google wrote on its Apps Status Dashboard.