I can share some information about QuickBooks Desktop Pro 2020 with Enhanced Payroll, @@flcw1234.
Your QuickBooks Pro will upgrade from 2018 to 2020, but not your payroll subscription.
For your payroll, you can activate the new subscription. Make sure to cancel the existing payroll so you won't be double charged.
Also, for your guidance with the payroll features in QuickBooks, feel free to check this article: QuickBooks Payroll Services and Features for QuickBooks Desktop.
Don't hesitate to leave a comment below if you have further concerns. I'd be glad to assist you. Have a nice day.