RobH_en_tn/luk/15/17.md

came to himself

This idiom means he realized what the truth was, that he had made a terrible mistake. Alternate translation: "clearly understood his situation" (See: rc://en/ta/man/translate/figs-idiom)

How many of my father's hired servants have more than enough food

This is part of an exclamation, and not a question. Alternate translation: "All my father's hired servants have more than enough food to eat"

dying from hunger

This is probably not an exaggeration. The young man may really have been starving.