Immigration officers are always available. Border is 24 hours open. Few of my friends even landed in weekend. If you concerned then just go after 8.00 am. Don't plan to go midnight hahahhaha. If border is open 24 hrs then it mean everytime someone there, and if someone their then they always have stamps handy. if they have stamps handy then they have computer system up running (because if someone from USA coming to Canada that late/early then they have to enter the person into computer and landing is same thing.)I just looked up from the website:
Border Information Service (BIS), provides computerized information 24 hours a day 7 days a week. Agents are only available regular business hours, Monday to Friday (08:00 - 16:00 local time/except holidays.
So what is the meaning of agents available? No agent on Sunday means can or cannot do landing? Pls advise.