Batting practice time

Well, I bought tickets to go see a blue jays game this weekend vs the bosox. It is a day game, and i bought tickets in the 100 section, lower level of the left field outfield (where Big Frank, Wells and Rios all happen to pull) and I am planning to go there in time for batting practice, to catch some baseballs. When would they start doing it?

Note: It is a day game.

Would be nice to find out, thanks.