There are 3 phases to making the film
Pre Production Script writing and editing for the future film
Production what we are currently on right now Mike Meyers and Eddie Murphy are recording lines until phase 3 note Production can take 18 months or 2-4 years now keep in mind that as long as all 4 Shrek films are on Netflix along with puss in boots it is making good progress
Post production the final touches we could likely see clips from the film at the time