Matthew Poole and continuators on Exodus 18:24

24 So Moses hearkened to the voice of his father in law , and did all that he had said .

This is one evidence of that meekness for which Moses is justly magnified, that he disdained not to receive advice from one so much his inferiour in Wisdom and Learning and knowledge of the things of God. And God would have this wise Counsel to come from Iethro, not from Moses himself, to shew how variously he distributes his gifts, and to teach all men not to think too highly of themselves nor to despise the counsels even of their inferiours.

Not immediately, but after he had received Gods approbation, Numb. 11. 16. and the peoples consent, Deut. 1. 14.