It is not wrong to consider that Jesus was the Son of God even before the foundation of the world...but it is in the world that we see the timeline manifest:
Matthew 3:16-17
16 When He had been baptized, Jesus came up immediately from the water; and behold, the heavens were opened to Him, and He saw the Spirit of God descending like a dove and alighting upon Him. 17 And suddenly a voice
came from heaven, saying, “This is My beloved Son, in whom I am well pleased.”
Colossians 1:18
And He is the head of the body, the church, who is the beginning, the
firstborn from the dead, that in all things He may have the preeminence.
Revelation 1:5
and from Jesus Christ, the faithful witness, the
firstborn from the dead, and the ruler over the kings of the earth. To Him who loved us and washed us from our sins in His own blood,
So...if we say that Jesus was first born of the flesh, a man, as those who are dead, after John's baptism, we are correct. But also, if we say that He was the Son even before the foundation of the world, we are also correct.
That is the thing about "created" time.