Old news Bend alot. Boeing has conceded the point and MAX aircraft and are actively retrofitting the aircraft already built. There is a least one team of mechanics at Boeing dedicated to performing the wiring change:
On the flight line in Renton, where crews are working outdoors to rewire each already built but still grounded 737 MAX to meet Federal Aviation Administration (FAA) wiring separation requirements, an inspector described a feeling of familylike connection and protectiveness among his work crew.
They work together rewiring each MAX over two days, then another plane is rolled into their stall and they repeat. Familiar with each other’s home circumstances and their adherence to precautions, they have contact with few other employees.
https://www.seattletimes.com/busines...-layoffs-loom/
Standard procedure is that type certification is highly coordinated between the FAA and EASA and final approval happens at the same time - or at worst a day or two apart. Other cert organizations (e.g. Russian, China, etc.) happen separately and can follow anywhere from days to years later.
However the 737 MAX fiasco has been anything but 'Standard', so who knows (and those who may know are not talking).