Do not confuse what is contained in the New Testament with anything written by the Watchtower/ JW's. That is the first rule when trying to avoid confusion dear Wildelover.
The N.T as we have it today is a collection of writings that the Roman Catholic church considered in about 381 or 2 A.D should be included as "canonical " and therefore inspired scripture.
They left out a hell of a lot of early Christian writings.
What they have included are , in date order, the writings of Paul himself, the Deuteropauline writings, those supposedly from Paul but actually from the "School" of Paul, a few individual items, Hebrews, James, etc and then the Gospels and then Revelation probably followed by the Letters of "John".
Arguments as to the exact dating will continue forever, but I have tried to outline a consensus of opinion.
Notice the writings of Paul are the earliest, so these are closer to the original teaching by Jesus about the "Kingdom" than the Gospels or anything else.
Which does not mean they reflect necessarily what "Jesus" himself spoke of. We must remember that what seems to have happened is that a very charismatic teacher, Jesus , lived and taught in Palestine up until around 30C.E, the most probable date for his death.
It seems that straight away a myth grew up that he was more than a mere man, and was raised up from the dead, "congregations" of "followers" sprang up.
Seeing these as a threat to Judaism, which was probably why "Jesus" met his demise, Saul began to persecute any who were propagating the myth, but he had his "experience" on the road to Damascus that was so real to him he went and learned as much about the Teacher as he could, he then began to evolve his own explanation for it all, and his strain of the Jesus Cult was born.
To Paul it was all about Christ being alive in Heaven and salvation through Him, the "Kingdom" was more of an add on, "an administration" as the NWT has it.
What the Teacher Jesus really taught and said and did ,is lost in the mists of time, the late writings like the Gospels, are written with an agenda all of their own, even what is probably the earliest Mark, is no real window into what really happened, it is the start of the myth of Jesus.
None of what is contained in the Bible we have today is prophetic I.M.H.O
p.s I hope you are doing well, and you are progressing toward a proper fade ?