I would do your PS about an hour before the scheduled time for them.
We did this on our visit, but when they started, we couldn't see them from our table, and had to bend over and stand over someone elses table to even see them, so we decided it wasn't worth teh effort and went back to eating. So just be aware that not all tables view them, but you might be able to get there a bit early and request a view if you want...