Ahab asks this question to emphasize that they should have already recaptured Ramoth Gilead. Alternate translation: "Ramoth Gilead is ours, but we have done nothing yet to take it from the hand of the king of Aram." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Here the word "hand" refers to power. Alternate translation: "to take it from the control of the king of Aram" (See: [[rc://en/ta/man/translate/figs-metonymy]])