Is the death of a father in the mosque while performing the Dhuhr prayer and his intention to perform the funeral prayer considered a good omen for him, and does a good ending protect him from the torment of Hellfire?

Dying in a state of obedience is a sign of a good ending, for which goodness and entry into Paradise are hoped for its possessor, based on the Prophet's (peace be upon him) saying: "Indeed, the dweller of Paradise will have his life concluded with the deeds of the people of Paradise." There is no indication that any good deed protects from the torment of the grave, except for specific acts such as martyrdom in the way of Allah, as it is stated in the Hadith (definition): "And he will be secure from the greatest terror and from the punishment of the grave."