غُدُوًّا وَعَشِيًّا
Morning and evening.
The exposure of Pharaoh's people to the Fire comes before the mention of the Hour being established, making it evidence for punishment in the intermediate state.
وَيَوْمَ تَقُومُ السَّاعَةُ
And on the Day the Hour is established.
A distinct command then follows: “Admit Pharaoh's people to the severest punishment.” The punishment of the grave and the final punishment after resurrection are therefore not treated as a single stage.