Could Christ Return At Any Moment? Has The Gospel Been Presented To The Entire World?

As Jesus was sitting on the Mount of Olives, the disciples came to him privately. “ Tell us,” they said  “When will these things be?...
As Jesus was sitting on the Mount of Olives, the disciples came to him privately. “ Tell us,” they said  “When will these things be? And what will be the sign of your coming, and of the end of the age?”   Matthew 24:3 After listing a number of signs, He reveals one of those signs would be that the gospel would be preached to the entire world. "This gospel of the kingdom shall be preached in the whole world as a testimony to all the nations, and then the end will come"  (Matthew 24:14) "And the gospel must first be...