3 daily prayers even for gentiles

This Shabos I was studying Likutay Halachos (Collection of Laws - Rabbi Nussuns explains the laws in light of the Torah of Rabbi Nachman), at the end of the Laws of Mincha. Rabbi Nussun writes that the Avos - forefathers, Abraham Isaac and Jacob, who canonized the 3 daily prayers (Abraham - Shacharis - the morning prayer. Isaac - Mincha - the afternoon prayer. Jacob - Maariv - the night prayer) did so for the entire world. From this it would seem that the 3 daily prayers are geared even for gentiles.