You don't have time to "wait and see" if e-file for an amended 1065 will be available or not. Since the extension deadline for a 1065 is Sept 15th, (oct 15 for a *PERSONAL* 1040 return) you need to quit hoping and print the amended 1065, sign it and mail it. I realize this is not an extension. But you can fully expect the ability to e-file the 2019 form 1065 (amended or not) to be TURNED OFF completely and forever on Sept 15th by the IRS - not by TurboTax.
