When should the people get up for the Salat (prayer) if they see the Imam (the person leading Salat) during the Iqama?

Narrated 'Abdullah bin Abi Qatada:

My father said. "Allah's Apostle ﷺ said, 'If the Iqama is pronounced then do not stand for the prayer till you see me (in front of you).' "

حَدَّثَنَا مُسْلِمُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا هِشَامٌ، قَالَ كَتَبَ إِلَىَّ يَحْيَى عَنْ عَبْدِ اللَّهِ بْنِ أَبِي قَتَادَةَ، عَنْ أَبِيهِ، قَالَ قَالَ رَسُولُ اللَّهِ ﷺ " إِذَا أُقِيمَتِ الصَّلاَةُ فَلاَ تَقُومُوا حَتَّى تَرَوْنِي ".