Colossians 1:23 - "The Good News has been preached all over the world, and I, Paul, have been appointed as God’s servant to proclaim it." (New Living Translation)
And shortly after Paul wrote this, the end which Jesus spoke about took place - in 70 C.E.
Even the org agrees that it had already been preached "worldwide":
w74 1/15 p. 61 - What did the apostle Paul mean when he indicated that the ‘good news was being preached in all creation under heaven’? - Col. 1:23. "...that the preaching was being pushed to all parts of the earth under heaven."