I think to be ready for actual service in 2-3 years, when 003 enters service, the new airframe will have to not only be flying, but also undergoing catapult launch test, arrested landing tests, experimental deck handling trials, now.
the Chinese have no shortage of experience building air worthy turboprops. So flying this thing is no big deal. What they have not had very much experience with is designing airframe structure stressed for carrier handling, folding wing mechanism, and aircraft equipment for carrier handling. If the airframe contains flaws that needs to rectified before service, it is unlikely to be with airworthiness, it will be much more likely stem from carrier handling requirementw.