Agreeing on Khul` provided that the consideration is paid upon the woman's marriage
There is no impediment for the permissibility of
deferring the compensation of Khul‘ for an appointed time. However, deferring the compensation of Khul` until the wife in question marries another man is not valid for this is not an appointed term. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.