As for waiting for the 2018 amended Form 1040 to process, it "wouldn't hurt", but if your e-filed 2019 is accepted by the IRS the return will be processed. Because you must print and mail your 2018 amended tax return anyway, another option is to print and mail your 2019 tax return with the 2018 amended tax return.
Once that amended 2018 tax return is finished, you can either use that ".tax2018" file to start over on your 2019 tax return, or manually enter any amounts that carry-over to 2019 from 2018. Which is better for you probably depends on the nature and complexity of your particular tax return.
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