It can be read anytime but the point is to have as many worshippers as possible offering the funeral prayer as it is an intercession for the deceased and the more there are worshippers, the better it is for him.

If a person dies late night or such a time when it’s not time for prayer…Neither zuhr or asr or maghrib or isha or fajr…shud the family members delay the funeral prayer so as to combine it after fard salaah? or can the funeral prayer b read anytime irrespective whether or not there is any salaah time?