Looks like things are moving along: https://airlineweekly.com/2021/10/un...of-faa-action/

"The Chicago-based carrier, in collaboration with Boeing, has begin modifications to the aft bulkhead of the inlet cowl, United Senior Vice President of Flight Operations Bryan Quigley told pilots in an internal newsletter on October 6. In an unusual move, the work is being done ahead of an U.S. Federal Aviation Administration (FAA) airworthiness directive, posing some risk of the final mandate not matching the the work undertaken by United."