Who is shaitan referring to in verse 38:79

In [verse 79 in Surah Sad](https://myislam.org/surah-sad/ayat-79/) , after Shaitan refused to bow down before Adam (AS): > He said, "My Lord, then reprieve me until the Day they are resurrected." Is shaitan referring to the resurrection of humanity on Day of Judgement? If so, did he already know Allah's plan to send Adam (AS) to earth, spread humanity, etc.? If not, was he referring to life that had already passed away? If so, what life was he referring to?