What church are you referring to?
Some believe that everything is already fulfilled that needs to be fulfilled before His return. The premillenial rapture believers are expecting Him any day now.
Yes, I suppose there should be a stated distinction between the would-be church and the actual church. Indeed there is both, and both
by design, one of flesh and blood and of the world, and one of the spirit of God.
The one church of flesh and blood does not carry the water of the Spirit, but merely carries the words of the gospel. Having not fully received God in spirit, they do not have much of the spirit to give. It is as if they know of the mustard seed, but it has not grown in them, so they have only had seeds to offer these many generations. Each generation (by design) then has an equal opportunity as the first generation did when salvation first came, to make that same choice for themselves. That was the choice of life and death that Jesus set before the early church (flesh and blood or the Spirit,
Matthew 16:17), just as was set before Adam and Eve, and just as Moses also set before Israel.
Unbeknownst to them the actual church which Jesus said He would build upon what comes forth
from the Father, has also been being built, as Peter said, "
you also, as living stones, are being built up a spiritual house, a holy priesthood, to offer up spiritual sacrifices acceptable to God through Jesus Christ."
1 Peter 2:5
As for "everything is already fulfilled", there is much confusion. Some mean "fulfilled" as if to say the opportunity for salvation has already come and gone and that everyone since then missed out, which as Paul pointed out, is not at all true. Some (including Paul) rather have taken Jesus at His word that He did come to fulfill all that is written of the law and the prophets; that it would come and has come upon that very generation He personally spoke it to saying "
you will see" it; and that as He also said by Revelation, that all these things would "
shortly take place", rather what has been taught of "gap", pre, post, or mid tribulation theories and in effect, saying "
My master is delaying his coming."
Paul explained that
it was none of the theories that have been taught, but rather than a mass event back then or in the future, the coming of Christ's return would be "
but each one in his own order." So that just as through one man all sinned unto death--but not all at once, but in his own time, and also as through One all who are saved receive life everlasting--this too does not come all at once, "
but each one in his own order." Which was delivered to us, the gentiles, until the times are fulfilled.