After you file

Yes, when amending a tax return the TurboTax program will create a Form 1040-X.

 

An 2018 amended tax return, Form 1040X, can only be printed, signed, dated and mailed by you to the IRS. The IRS will take up to 4 months or longer to process the amended tax return.

 

See this TurboTax support FAQ for amending a 2018 tax return - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-a-return-in-turbotax/01/27579