Is it valid to describe the Prophet, may Allah bless him and grant him peace, by saying "both his hands are right hands," based on what was narrated from the Arabs in describing a creation this way out of reverence, and what the Prophet himself stated about seeing from behind his back?

Indeed, it is established that Allah Almighty is described as having "both His hands as right hands." It is also authentically reported in the Hadith that the Prophet, peace and blessings be upon him, said: "The just ones will be with Allah on pulpits of light, to the right of the Most Merciful, عز وجل (Exalted and Glorified is He), and both His hands are right hands." Similarly, there is no impediment to describing the Prophet, peace and blessings be upon him, in this manner if what is intended is generosity and munificence. As for the fact that he sees from behind his back, this is true, due to his saying, peace and blessings be upon him: "Straighten your rows, for I see you from behind my back."