Neither scheduling option will accomplish your goal, which is to 1) apply policies to computers so that they 2) download the patches ahead of time before they 3) install at a scheduled time and then reboot.
Unless you happen to be running 7.1 already, but that was just released on Monday. 7.1 allows you to tell software to download prior to execution.
Am I understanding correctly that if you apply a patch policy and tell them to install at 2 a.m. on Saturday, that you want them to have everything downloaded and ready to go by Saturday at 2 a.m.? If so, this is the feature I'm talking about above that's available in 7.1
If I'm not understanding correctly, pleas elet me know what you're looking to do instead.