How much ahead of time at Pearson?
 

I'll be checking in on line for a 6:30 a.m. flight to Orlando from YYZ. I know that once you checkin in person, you have to go straight to US immigration. How early do I need to be these days considering I'll have my boarding card already. It will be a Friday morning.

Immigration doesn't open up until around 4:30, so it doesn't help to get there before then. Even then, they only admit people based on when their flight leaves.

You're fine at 4:30, I'll be there as well, going YYZ-CLE, getting there any earlier just means you line up outside immigration