My understanding is that the Rapture Index closely tracks the target benchmark provided by the Bulletin of Atomic Scientists. They're calling it - 100 seconds to midnight, or 17 furlongs short of a country mile in standard units of international geopolitical unrest.
That means the chance of Rapture is 99.884%! So get those masks on (personally, I'll wait for Brother Jeb's update before doing anything rash).