Agreed. The time in which those of Israel would either abide, or be cut out, was just ahead for them.
That does not change the fact that not one of them were trusting in the Cross of Christ, nor understood that which Christ came to do. He was a failure as a Messiah for them, for the Messiah they looked for could not, would not die, but establish the Everlating Kingdom through triumph over
their enemies.
And I emphasize
their.
It would not be until they were born again that they would understand...they were the enemies of God:
Romans 5:10
For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.
To the contrary, many were empowered to witness and even perform works of healing and power in the name of Jesus prior to the cross. See Luke 10:1-20 and Matthew 10:1
And the testimony they conveyed was that of the Kingdom, not the Gospel of Jesus Christ. They were sent unto the Lost Sheep of Israel, which in the Greek, "lost means basically that they were a people in a state of destruction.
And despite being empowered to heal, preach, and cast out demons, again, not one of them could be said to be abiding in Christ. The reason is that at that point, until Baptized with the Holy Ghost Who revealed the Mystery of the Gospel to them, they were natural men still in need of the Reconciliation.
And to once again clarify I am not saying they were not saved, we understand that the Elect are known to God from before the foundation of the world. The Just among the Old Testament Saints enjoyed the security of salvation just as we do, and some of them even knew that, but, that does not mean they understood that God would take on the flesh of man and die in His place, thereby establishing the grounds for Reconciliation, that we might be brought back into the union with God on an eternal and spiritual level.
I know it is a difficult concept to consider men like Noah, Abraham, Moses, and other great men of faith as...natural. But that is the case.
The Baptism with the Holy Ghost has a specific point in time in which it began to be effected, and that is at Pentecost. And once again, to touch back on the point of your response, we see that the disciples were not empowered until Pentecost to be witnesses of Christ, at which time with understanding given them of the Gospel of Christ, they immediately begin to proclaim a message which they did not take to the lost Sheep of Israel previously:
Acts 1:6-8
King James Version (KJV)
6 When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?
7 And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.
8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.
It is absolutely vital that we acknowledge the progressive nature of revelation in Scripture. Truly Christ was promised in the Garden at the Fall, but we do not equate that with the Revelation of the Mystery of the Gospel of Jesus Christ provided us when the New Covenant abrogated that Covenant which could not justify, could make righteous, and could not even make fallen man...keep that Covenant.
God said "I will put My Spirit within you and cause you to walk in My statutes and to keep my judgments." When He said that it was yet promise, and that is what the disciples were told to await in Jerusalem:
Acts 1:4-5
King James Version (KJV)
4 And, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me.
5 For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence.
Christ defines that promise as central to the coming of the Comforter, Who He had taught them of, as contrasting John's baptism of Repentance with the Baptism with the Holy Ghost.
That is what they were to wait for, and when He did come on the Day of Pentecost, they immediately began to preach the Gospel of Jesus Christ. Not the Gospel of the Kingdom, which they were sent out to preach previously.
God bless.