question #2 Sahih al-Bukhari 6402, Book 80, Hadith 97 : How does the timing of saying ‘Amin’ affect the forgiveness of sins?

The Prophet (ﷺ) said, “When the Imam says ‘Amin’, then you should all say ‘Amin’, for the angels say
‘Amin’ at that time, and he whose ‘Amin’ coincides with the ‘Amin’ of the angels, all his past sins will
be forgiven.”