Matthew 24:14 And this good news of the Kingdom will be preached in all the inhabited earth for a witness to all the nations, and then the end will come.
Mark 13:10 Also, in all the nations, the good news has to be preached first.
Luc 24:46 and he said to them, “This is what is written: that the Christ would suffer and rise from among the dead on the third day, 47 and on the basis of his name, repentance for forgiveness of sins would be preached in all the nations—starting out from Jerusalem. 48 You are to be witnesses of these things.
This work is nearing its end. I think more than 99% of the world’s adults have heard about Jesus and the message that he died for our sins. Surely the majority of them have heard the teaching that Jesus will return to judge the world also.
The message will surely become even more frequent in the mass media when the end time persecution of Christians begins. Also the two witnesses will get much attention in all the world during their 42 month witnessing. (Revelation chapter 11)
So there is no doubt that the good news about Jesus will be preached in all the world before the end comes.