When I was in Toronto about 5 years ago I went to a Blue Jays game against the Orioles. The players are very friendly and it was a very small line to get autographs. I think I got there about an hour early, maybe a bit earlier.
I would probably suggest going for the Blue Jays, but if you see people signing obviously you can run to the other dugout. I snagged Miguel Tejada and about 6 other players when I was there. Enjoy!
I collect Randy Moss and Giannis Antetokounpo Autographs