Laban uses a question to emphasize that he should pay Jacob for working for him. The question can be translated as a statement. This can also be stated in positive form. AT: "It is certainly right that I should pay you for working for me even though you are my relative." (See: [[rc://en/ta/man/translate/figs-rquestion]] and [[rc://en/ta/man/translate/figs-litotes]])
The word "now" is used here to mark a change from the story to background information about Laban and his daughters. (See: [[rc://en/ta/man/translate/writing-background]])