It's really strange. Especially because historically, from what I can see on the results pages here, McGill notifies successful applicants relatively early on (at least for PhD, and a few MAs). I think the only explanation is that they literally haven't opened/begun reviewing ours yet. That has to be it? Unless they have begun reviewing ours but have just neglected to change the statuses.
I admit I called IT services at McGill and they told me they couldn't tell if my application had been opened or not by the department. No reassurance to be had.