At that point, 'the Kingdom of Heaven' meant what the prophets consistently said it meant and they did not say that it was 'the kingdom of heaven' within a person but it was to be a rule over planet earth from Jerusalem.
Zec 9:9 Rejoice greatly, O daughter of Zion; shout, O daughter of Jerusalem: behold, thy King cometh unto thee: he is just, and having salvation; lowly, and riding upon an ***, and upon a colt the foal of an ***.
Zec 9:10 And I will cut off the chariot from Ephraim, and the horse from Jerusalem, and the battle bow shall be cut off: and he shall speak peace unto the heathen: and his dominion shall be from sea even to sea, and from the river even to the ends of the earth.
Yep...
Luke 11:20 But if I with the finger of God cast out devils, no doubt the kingdom of God is come upon you.
Matthew 10:5 These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into any city of the Samaritans enter ye not: 10:6 But go rather to the lost sheep of the house of Israel. 10:7 And as ye go, preach, saying, The kingdom of heaven is at hand. 10:8 Heal the sick, cleanse the lepers, raise the dead, cast out devils: freely ye have received, freely give.
Their Prophesied King was in their midst...
John 1:14 And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth.
1:25 And they asked him, and said unto him, Why baptizest thou then, if thou be not that Christ, nor Elias, neither that prophet? 1:26 John answered them, saying, I baptize with water: but there standeth one among you, whom ye know not; 1:27 He it is, who coming after me is preferred before me, whose shoe's latchet I am not worthy to unloose.
1:30 This is he of whom I said, After me cometh a man which is preferred before me: for he was before me. 1:31 And I knew him not: but that he should be made manifest to Israel, therefore am I come baptizing with water. 1:32 And John bare record, saying, I saw the Spirit descending from heaven like a dove, and it abode upon him. 1:33 And I knew him not: but he that sent me to baptize with water, the same said unto me, Upon whom thou shalt see the Spirit descending, and remaining on him, the same is he which baptizeth with the Holy Ghost. 1:34 And I saw, and bare record that this is the Son of God.
1:45 Philip findeth Nathanael, and saith unto him, We have found him, of whom Moses in the law, and the prophets, did write, Jesus of Nazareth, the son of Joseph.
1:49 Nathanael answered and saith unto him, Rabbi, thou art the Son of God; thou art the King of Israel.
1:51 And he saith unto him, Verily, verily, I say unto you, Hereafter ye shall see heaven open, and the angels of God ascending and descending upon the Son of man.
As usual, the answers are in "the things that differ."