What is the ruling on putting oil on figs to speed up their ripening and regulate the harvesting process, and does this act fall under the saying of the Prophet, peace and blessings be upon him: "You are more knowledgeable in the affairs of your worldly life"?

The basic principle regarding the treatment of fruits to accelerate their ripening and complete their harvest is permissibility, unless it involves health harm or defrauding the buyer. If placing drops of oil on figs does not cause harm or deception, then there is no objection to it.