You should wait to file your amended return until you get the refund from your original return.
Even if your original return has been accepted by the IRS, it's still possible that the IRS could change your refund or balance due on that return.
Please see the TurboTax article "How to amend (change or correct) a return you already filed" for additional information.
[Edited 3|17|2020 2:48 pm]
