I am in a hurry in the sense of being impatient, which is actually not a good trait but understandable considering the 7 months since the signature with the developer...
And of course I would not take any risks. It won’t come to that. I would like to see that the developer has officially started the work. It doesn’t necessarily have to be pouring the slab. Official surveying and staking out would also be okay. Because I fear that when the weather improves again, we will have to queue up again since the work hasn’t started with us anyway. So "We start in March" quickly becomes "Oops, it’s already the end of May, strange..."