We went late Apr to mid May 2013, and it was not on the intinerary. We tried to get our PD to stop there on the way from Agrigento to Syracuse, but there was not enough time.
However, a recent group did stop there, as posted in a review; so we suggest asking for a stop there, as soon as your Sicily PD emails you. We may have waited too late with our request!
Please enjoy Sicily, and see more info in our review on the Sicily web page.