First of all,
“The Dajjal will not appear until the people become negligent in talking about him, and until the Imams abandon talking about him on the Minbars (in their Khutba).” (Narrated in Majma Al-Zawaid)
If that happens, then the last signs of his emergence come from a hadith narrated by Hazrat Asman Bint Yazeed (ra). I will only quote a part of the hadith, which says that,
“The Prophet (pbuh) once came...