English: "From the time the sickle is first put to the standing grain" — that everything should be in the standing state, that it should be the first of all that is reaped, and that its reaping should be only with a sickle.
On the daf / in context: The Omer must be the first grain cut, and the cutting must be performed with a sickle (not by hand-plucking).
Type of Learning
Derash on the verse (Menachos) — the Omer is the first reaping and is cut with a sickle.
What Is Learned
The Omer must be the first grain reaped in the field and must be cut with a sickle.