Think of it this way, we're at a party in the Hollywood hills somewhere, and I've just met you. After meeting you I whip out my smartphone to pull you up on IMDB (unlikely I would bother, but you've indicated this is fairly accurate).. I find you, and you have a single entry on your IMDB page for a film that's in production, or post production.. Honestly, that doesn't do anything for my opinion of you one way or the other, unless you're trying to sell yourself as way more experienced, and you still only have the one entry for a film I have no way of seeing (yet).
It just doesn't logically make sense that it would help you at all. If your actors are already listed, having another entry for a film in post production might be a little nice for them, but significantly less so than one for a film that's released, or in Pre/current/post production that has big names attached.