I don't think he has long left. The Italian government was desperate to arrest him and did what they always do when they are desperate to arrest a boss on the run. They arrested his inner circle and family members. Most Sicilian bosses do not flee their territories when they are on the run. Messina still has a few trusted lieutenants not in prison, but with the amount of pressure the Italian government has put on the mafia clans, he won't stay hidden for very long unless he left Sicily already. Imo