sit at the right hand .... means in POWER. there is ONLY one who sit on the THRONE, and that's GOD, the Lord Jesus, who is Now Glorified in heavenly flesh and bone. the Amalgamation of Spirit and a body, flesh and bone.Cool.
When Scripture makes an analogy, it can't be wrong to reference that same analogy: "YHWH says to my Lord: 'Sit at my right hand, until I make your enemies your footstool.'" Psalm 110:1. This is the most quoted verse in the NT.
now note, he who sits is the LORD .... in Flesh, supportive scripture, Psalms 132:11 "The LORD hath sworn in truth unto David; he will not turn from it; Of the fruit of thy body will I set upon thy throne.".
now.... in concrete form, there is no one next to him either right or left. listen and Learn, Revelation 3:21 " To him that overcometh will I grant to sit with me in my throne, even as I also overcame, and am set down with my Father in his throne." got it now? there is no one sitting on the left or right, physically, but IN, IN, IN. how do you know this 101G? John 14:20 " At that day ye shall know that I am in my Father, and ye in me, and I in you."