On the way to the supermarket, we dropped in at the site to see how much of the filling-in they had done yesterday. I would say that for the two sides that they have started to filled-in three-quarters of the two sides that they have started filling in, so I would expect that they need two or three more days until they are finished.
We also climbed down the ladder into the cellar. Inside our house for the very first time.
As you can see, at the moment there is quite a lot of water on the floor (because the concrete base was full of water before they built the cellar). Hopefully, it will dry out soon.