Good morning everyone (I'm in Tokyo right now

fighting jet lag) -
Does anyone know what time the ticket counters for Air Canada open at Narita - is it a few hours before AC 2 & 4 depart or is it any earlier in the day?
I'm booked on AC 2 tomorrow (Saturday) and currently wait listed for an upgrade - as online check-in will open up in about 15 hours I'm thinking I'll need to get to the airport early to get myself back on the upgrade wait list. There are a number of empty seats in J class right now, so I'm pretty confident I should be fine, but better to be safe than sorry...
By the way, I have to say that seats 11a & 11k on the 777-300's are wonderful - beyond the privacy, they have tons of "shelf space" that is very handy!
Thanks!
Kiron