"Indeed, you are today with us" meaning, in our presence, "established in position" in terms of rank, "trusted" in terms of integrity. Thus, the King appointed him and removed the Aziz.
﴿إِنَّك الْيَوْم لدينا﴾ عندنَا ﴿مكين﴾ فِي الْمنزلَة ﴿امين﴾ مِنَ الأَمَانَةِ، فَوَلاهُ الْمَلِكُ، وَعَزَلَ الْعَزِيز