You must answer the question based on how the 2018 income tax return is currently filed, not based on the intent to amend.
You are free to wait until you amend the 2018 income tax return before you file the 2019 income tax return. If the amended return is not processed before July 15, 2020, you still have the option of filing for an automatic 6 month extension to file your 2019 income tax return.
[Edited 03/26/20 to reflect IRS and state extended due dates]
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