The process that sends out emails about OLCI appears to be on GMT. It just sent me an email for check-in for my flight that's at 10:35 tomorrow. It's 9:35 right now.

More curiously, when I log into MMB, I'm seeing "Online checkin opens in 2 days X hours Y minutes", which refers to my return flight. Makes me wonder if check-in will actually open in an hour.