The Targum Pseudo-Jonathan on Exodus 10:13 describes the delivery mechanism with quiet care.
"Mosheh lifted up his rod over the land of Mizraim, and the Lord brought an east wind upon the country all that day and all the night; and in the morning the east wind bare the locust."
An east wind, the Targum notes — ruach kidum. All that day and all that night. The locusts did not simply appear. They were driven. Carried on the back of a specific wind, from a specific direction, for a specific duration.
The sages noticed this detail carefully. The east wind in the Torah is not a neutral weather event. It will return to drive the plague away in a few verses. It will return again at the Red Sea, splitting the waters. It will return in prophetic literature as the wind of judgment. The east wind is, in a sense, the Holy One's preferred breath when He wishes to move vast forces.
An entire day. An entire night. The Maggid teaches: the Holy One does not rush His plagues. He takes His time. The locusts needed twenty-four hours of steady wind to reach Egypt, and the Lord provided exactly that — no more, no less. In the meantime, Pharaoh could still have called Moses back. He could have sent word, released the slaves, averted the plague. The wind was blowing. The clock was running. And Pharaoh did nothing.