There are two biblical positions. One defines "sonship" as proceeding from the Father (the Logos or the Word). The other looks to "today I have begotten You" (which speaks of the Resurrection - not the Incarnation).'Hear, O Israel, Jehovah our God is one Jehovah; Deut 6:4
A Psalm of David. The affirmation of Jehovah to my Lord: 'Sit at My right hand, Till I make thine enemies thy footstool.' Psalms 110:1
And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you. Ex 3:14 KJV
I am that I am - אהיה אשר אהיה Eheyeh asher Eheyeh
John Calvin commentary - .I am that I am. The verb in the Hebrew is in the future tense, “I will be what I will be;
Adam Clarke - As the original words literally signify, I will be what I will be,
And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name JESUS. He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David:
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. John 1:14
Not sure about your question but mine would be; Did the Word, I will be what I will be, become flesh, when the Son of the Highest was conceived in and brought forth from, the seed of the virgin woman, Mary?
But Scripture has the Father referring to Christ as His Son before the the Resurrection.
Point being "today I have begotten You" refers to Christ as the Firstborn raised from the dead and given the glory and honor He had previously set aside.
I belueve Christ us the Word (eternally the "expression" of the Father) and in that sense hold the former definition on "Sonship".
Acts 13:30–34 But God raised Him from the dead;
and for many days He appeared to those who came up with Him from Galilee to Jerusalem, the very ones who are now His witnesses to the people. “And we preach to you the good news of the promise made to the fathers,that God has fulfilled this promise to our children in that He raised up Jesus, as it is also written in the second Psalm, ‘You are My Son; today i have begotten You.’As for the fact that He raised Him up from the dead, no longer to return to decay, He has spoken in this way: ‘I will give you the holy and sure blessings of David.’