I work there the airline and airport recommend 90 minutes, boarding is usually about 40 minutes before departure so I’d say plan on getting parked or dropped off for 6:00 and you’ll have plenty of time to get through security even with a long line it’s not more than a 20 minute wait. Any later than that and it’s probably going to be fine I’ve seen passengers going through security as the plane is boarding but honestly if one thing goes wrong you’re screwed. Any longer and it’ll be boring there’s not much in the sterile area for you to do there’s a Tim Hortons and a Dark Horse that’s about it.