Question about pouring concrete

He should pump the water out if possible to take advantage of the sun and wind to dry it out as much as possible. Make sure he puts down a good vapor/ moisture barrier on the patio. Should be good to pour in a day or two

Without seeing the plasticity of the clay in person hard to tell. I wouldn't be to concerned with pouring directly on the soil for the patio as it is not subject to heavy loads. But for your driveway I'd seriously consider excavating out 4-6" of the clay and installing a basecourse (crushed concrete, CR610, #57 Stone, etc.). It'll add some cost but best to do this only one time. How thick is he planning to pour the driveway? This will create a "drainage layer" so to speak to allow any water that percs through the concrete to disperse instead of being directly absorbed by the clay and potentially causing some settlement.

4" for the driveway. The driveway is connected to the patio as the garage is in the back of the lot. We usually just park wife's car at the beginning of the driveway. We don't drive it all the way back or put in the the garage. I park my car on the street.

Concrete is supposed to cure [dry] slowly, over many weeks. So having the soil wet or even a little water on it, is a good thing.