His saying: "The Reckoning for mankind has approached" means that it is near.

Yahya narrated from Khadash, from Abu Amir, from Abu Imran al-Jawni, who said: The Messenger of Allah (ﷺ) said: "When I was sent, the bearer of the Trumpet was sent, and he moved it toward his mouth, put one foot forward and one foot back, waiting for when he will be commanded to blow; so beware of the blowing [of the Trumpet]."

"And they are in neglect," meaning: the polytheists regarding the Hereafter,

"turning away" from the Quran.