question #1 Sahih al-Bukhari 872, Book 10, Hadith 263 : What does this narration indicate about the timing of the Fajr prayer during the Prophet’s time?

Allah’s Messenger (ﷺ) used to offer the Fajr prayer when it was still dark and the believing women used to
return (after finishing their prayer) and nobody could recognize them owing to darkness, or they could
not recognize one another.