What is the ruling on the imam being late for the prayer after the call to prayer, such that the worshippers wait for him, and is it better for the imam to arrive early, especially since he may come rushing to catch the congregation?

It has been established that when the Prophet, peace and blessings be upon him, went out for prayer, the iqama would be called, and sometimes he would delay until he was informed. It has been reported that the muezzin would inform the Imam of the prayer and its commencement, and Umar's saying: "The prayer, O Messenger of Allah! The women and children have slept." The Imam should not burden the worshippers by delaying his exit, and he should hasten to the prayer, adhering to the etiquette of walking to the mosque with calmness and dignity.