Im sorry if this has been addressed, i have not seen any topics on this yet.
The wt for today seems to state, quiet plainly, that preaching work is done. Para 14,15 the question asks:
"What proves that Jehovahs Witnesses have fulfilled Jesus' prophecy with regard to the scope of the work?"
of course the trick phrase there is "with regard to the scope". They will be able to weasel later and say 'we never said it was done, just that the scope is worldwide'