فَإِذَا زَالَتِ الشَّمْسُ مِنَ الْيَوْمِ الثَّانِي مِنَ النَّحْرِ رَمَى الْجِمَارَ الثَّلَاثَ
Translation: When the sun passes the meridian on the second day counted from the Sacrifice Day, he stones the three Jamarahs.
Zawāl is the sun's movement past the meridian. The passage does not mean simply after sunrise or in the morning.
For 11 Dhu al-Hijjah, the stipulation is after zawāl and includes all three stations. The single Aqabah stoning performed on the 10th cannot substitute for the three-station stoning prescribed on the 11th.