According to this help page, it isn't possible to schedule a Quick Pay or Check Pay payment for a future date:
https://www.quicken.com/support/how-make-payments-using-quick-pay-and-check-pay Is that correct? If so, that's a non-starter for me, removing a feature that's been available in Quicken for decades using Checkfree / Quicken Bill Pay.
I get large bills 3-7 weeks in advance of their due date (e.g. credit card, insurance) or 5 months in advance (property tax bills), and I use Bill Pay to schedule them for payment when they're due. Will the new Quick / Check Pay, the billers will be getting the float on my money, unless I carefully set reminders to pay them on the day before their due date.
For a dumbed-down service, I might as well go to my bank.