1040-X is available from the IRS and you can use that literally today if you want.
This is for TurboTax downloaded program for Win or Mac
First TurboTax said 3/18, subject to delays
Now TurboTax says 3/25, subject to delays
Given the delays with unemployment forgiveness programming, it's not looking good.
Ostensibly, you will have a software update when you launch TurboTax as the code base needs to be update to support the amendment process (currently you can elect to amend, but then you're stopped pending software update).
Note: If you filed and your returns were accepted then either file manually with printed 1040-X if you will amend to get a refund or bigger refund, but wait for TurboTax update if you're going to owe more, as you can do whatever you like until 5/17 this year for your federal income tax return.
If you changed anything and saved, you're going to have to undo those changes. If you want to model your changes now, and you're using client version (win/mac) you can save your return as name-amended and use that to estimate your amendment pending the software update.
