ah ic, sorry missed that part, but still instead of finding an answer to this question when there is no benefit in it, we should cache this opportunity to teach our children to not to ask such questions as there is no benefit in them. only Allah knows best and to my knowledge there is no text regarding this in Islam
As far your conclusion that everything was created at once, do you have any clear text or understanding of classical scholars other than your own interpretaion? Allah Ta’ala doesn’t only create by saying "Kun faya koon; He also creates with His Hands as the Qur’an tells us that Allah Ta’ala created Adam ('alayhi as-salam with His two Hands.