Taking into consideration that the entire universe...
Taking into consideration that the entire universe, from this point of view, is a single unit, the act which Allah achieves is the creation of this one universe, and thus, Allah has only one thing to do - the creation of this world with all its details and diverse dimensions, extended over the vast expanse of time. This, however, does not mean that Allah has created the world in a single moment, and then it goes on automatically for ever.
Actually, they mean that this world, besides having its dimensions of length, width and thickness, which are collected together, it also has its dimension of time, too. The world, with this dimension, which spreads in the expanse of time, is a single unit. Producing such a thing does not happen in the time, since time contains the world, not Allah. This world had been created with its time, but in what time is Allah? He has no time.
The relation of the world, with all its phenomena along the time with Allah, is an existential one,