Wednesday is the deadline for Boeing South Carolina workers.

To set its unsettled production of the 787 Dreamliner on the right course at its North Charleston airplane assembly operation, earlier this year Boeing dangled a financial carrot for its workers.

If they meet certain goals by April 30 to reduce the amount of unfinished work on 787 parts sent to Washington state, where the 787 is also assembled, the Chicago-based aerospace giant will give its more than 5,000 permanent workers in North Charleston a reward.

If factory floor workers who build the passenger jets meet production goals on or before Wednesday, they get to take home 8 percent of their base pay for the previous 12 months in the form of a bonus.

Office workers, engineers, leaders and other white-collar employees get a flat $2,500 under the extra performance-based incentive if the goal is met.

If workers in the nonunionized plant fall short and meet the goals by June 30, the bonus drops to 60 percent of what it would have been. After June 30, the offer is off the table.

Boeing spokeswoman Candy Eslinger isn't tipping the company's hand ahead of time on the status of the production work, saying the airplane builder won't comment until after Wednesday.

Boeing's top brass said in an earnings call last week that much progress has been made, with 787 production goals of 10 a month in North Charleston and Everett, Wash., and is on track to meet delivery quotas this year, but there is still work to do.

That suggests the production wrinkles might not be totally ironed out, but that progress is being made toward reaching work goals. How much progress could become clearer Wednesday.

Boeing assembles the 787-8 in South Carolina and Washington state. The local plant also makes parts for the 787, including the 787-9 stretch version of the jet, and ships them to Everett. Starting this fall, the North Charleston operation will begin assembling the 787-9.

A decision on where the 787-10, the biggest version of the passenger plane, will be built will be made this year.

Reach Warren L. Wise at 937-5524 or twitter.com/warrenlancewise.