I would wait until you have the mins to apply. Then, if you don't hear anything right away, be diligent about keeping your app updated on their website as you gain more experience and/or credentials.

As far as growth goes, it's steady but controlled. They try to be careful about not taking on more than they can handle in terms of fleet size - it's a difficult balancing act for a small company that's trying to grow. AirShare is definitely a good place to work with a really great pilot group. I can honestly say I enjoy going to work, mainly because of the people I get to fly with.