Property Purchase / Timing of Ownership

The notarized purchase agreement does not state anything about the transfer of ownership? Normally, by signing you assume the traffic safety obligation on the parcel. All fruits are your property, unless you have agreed that the farmer may still harvest, otherwise he is out of luck.
Chronological sequence: draft purchase agreement + 2 weeks, then notary appointment - transfer money 2 weeks, transfer of possession, wait for real estate transfer tax notice +3 weeks, pay real estate transfer tax, clearance certificate from the tax office +2 weeks, all documents to the notary, from the notary to the land registry office + 1 week.
Registration in the new land register varies (in our case 3 months)
Transfer of ownership after registration

With us, a "Zug-um-Zug" handover was agreed.
That means: As soon as we had paid, we were the owners of the property, with all rights and obligations.
The land register took a few weeks, then we were owners as well. But even with possession transfer, the "harvest" would have been ours.

But regarding the relevance:
Per hectare, about 3 tons of wheat are produced, price per ton is about €180.
Let's assume the property has 700m² - then this is about wheat worth a proud €35!

But back to the relevance: About 3 tons of wheat are produced per hectare, the price per ton is about €180. Assuming the plot is 700m² - then we are talking about wheat worth a proud €35!

Minus the harvesting, transportation, and drying costs...

All right, thanks

Is the farmland even developed yet so that you can aim for an early start of construction? Have all applications already been approved by you? All of this takes longer than you think – I just assume that the farmland is now building land.