If you are eligible for the refund advance you can file your tax return at any time after you have received all the forms necessary to report your income on the tax return.
See this TurboTax support FAQ for the refund advance - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-refund/refund-advance/L52Mg0G5u_US_e...
