Using QB Payroll Online Core. If I submit payroll a day early, will it still pay employees on the regular payday?

Glad to have you here in the Community, cindyroewe.

Allow me to help you process your payroll on time. 

The payroll cut-off time is 5 PM on Wednesday. If you submit your payroll beyond that time ,it will be processed the next day. Your employees will get paid on Friday

If you choose direct deposit as your method of paying an employee, QuickBooks will notify you to process payroll at least two days before the paycheck date.

To verify your employee's payment method, please follow the instructions below:

1. Go to Workers.
2. Under Employees tab, select the employee.
3. Scroll down to question number 6 and click the pencil icon.
4. Click Done.

You can also check out this article to know more about how direct deposit works in QuickBooks Online: Pay employees and contractors with direct deposit.

If you have other concerns processing your payroll, you can comment anytime. I'll be glad to help you anytime. Take care!