The pharisees shouted blasphemy because Jesus called HImself the Son of Man which is a messianic title. Once again He told the pharisees He was the Messiah!
Jesus went to heaven when He ascended. but as to why the bible still shows this to be future let us look at it in its context.
DANIEL 7:
8 I considered the horns, and, behold, there came up among them another little horn, before whom there were three of the first horns plucked up by the roots: and, behold, in this horn were eyes like the eyes of man, and a mouth speaking great things.
9 I beheld till the thrones were cast down, and the Ancient of days did sit, whose garment was white as snow, and the hair of his head like the pure wool: his throne was like the fiery flame, and his wheels as burning fire.
10 A fiery stream issued and came forth from before him: thousand thousands ministered unto him, and ten thousand times ten thousand stood before him: the judgment was set, and the books were opened.
11 I beheld then because of the voice of the great words which the horn spake: I beheld even till the beast was slain, and his body destroyed, and given to the burning flame.
12 As concerning the rest of the beasts, they had their dominion taken away: yet their lives were prolonged for a season and time.
13 I saw in the night visions, and, behold, one like the Son of man came with the clouds of heaven, and came to the Ancient of days, and they brought him near before him.
14 And there was given him dominion, and glory, and a kingdom, that all people, nations, and languages, should serve him: his dominion is an everlasting dominion, which shall not pass away, and his kingdom that which shall not be destroyed.
ALL people nations and tongues are not serving Jesus, and Jesus has not received His kingdom yet. (See Rev. 12) that will happen at mid point of the tribulation.
But you are denying the words right out of Jesus' mouth because of when you think something happened which many think is in the future and many like me think it was in the past.
What Jesus says is fact so when did Jesus say that He received His authority in heaven and on earth?
Matthew 28:18-20
18 Then Jesus came to them and said, “All authority in heaven and on earth has been given to me. 19 Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, 20 and teaching them to obey everything I have commanded you. And surely I am with you always, to the very end of the age.”
When He ascended back to heaven