Giving life and final judgment are repeatedly divine functions in Israel's Scriptures.
Deuteronomy 32:39; 1 Samuel 2:6; Daniel 7:9-14 provide major background.
'Whatever' the Father does, the Son likewise does. The purpose of entrusting judgment to the Son is that all should honor the Son just as they honor the Father.
This is one of the strongest Synoptic-or-Johannine statements of divine function and honor while preserving personal distinction between Father and Son.