"Who being the brightness of his [Jehovah's] glory, and the express image of his person, and upholding all things by the word of his power, when he had by himself purged our sins, sat down on the right hand of the majesty on high; being made so much better than the angels, as he hath by inheritance obtained a more excellent name than they." (Hebrews 1:3,4) He was begotten to the divine nature at the time of his baptism in the Jordan.

He was born on the divine plane to the divine nature at his resurrection.

When he arose from the dead he was both Lord and Christ.

(Acts 2:36) Lord means one who owns; one who has power and authority, and one whom his followers acknowledge as Master and Lord.
Christ means the anointed one; the one appointed by Jehovah to carry out his great plan.

So now being raised from the dead he is both owner of all things and endowed with power and authority to carry out Jehovah's plan.