Delivering the Khutbah While Seated
Q: Is it okay if the khatib sits while delivering the khutbah?
A: It is recommended, not obligatory, to deliver the khutbah while standing. It is also recommended that this be done on the minbar which should be located to the right of the mihrab. If there is no minbar, it is recommended to deliver it from an elevated location. If the khatib stands on the ground, it is recommended that he be on the left of the mihrab.
Source: Sharh al-Muntaha & Kashshaf