No, you cannot use a pay stub to file a tax return. You have to use the W-2 received from your employer on the tax return.
To be even eligible for a tax refund advance in January 2021 you must have completed, e-filed your federal tax return and the IRS must accept the e-filed tax return.
Go to this TurboTax website for tax refund advance information - https://turbotax.intuit.com/refund-advance
