It is from the Apple Insider report that they do not comment on J. P. Morgan believes production of the final design of the 5-nanometer A14 chip will begin soon.
But it is very possible that the production of line weight IPhone 12 delay due to other factors.
"We believe production of new iPhones should begin in April – May but there will be no major issues with the production of TSMC."
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IPhone 12 weight production
Analysts think it's a process to make 5 nanometer chips (A14)
On the other hand, everything seems to indicate that the iPhone 12 engineering validation tests are completed internally april, a little later than in previous years. In addition, tests to confirm production and flight tests are expected to be scheduled eventually June, and later than in years past.
Due to these delays in production, the next-generation iPhone lineup will not start selling until October or November, instead of September, as has often happened in recent years.
"We believe it will be delayed for a month or two with the launch of the iPhone, but we do not believe it will be delayed for a quarter."
It's still too early to make any kind of content about the production and launch of the iPhone 12, but that's pretty sure Apple won't approve its lineup by 2021.