<blockquote class="Quote" rel="eric290">Sorry kung makululit, but can I get NBI now kahit wala pang invite or dapat yung date sa NBI is after invitation date?</blockquote>
Yup you can get it before invitation. But beware like chewychewbacca said, your IED depends on your PCC or medicals, whichever is the earliest.
If plan mo lumipad to AU agad after magrant visa mo, no problem.
I suggest if you think maiinvite ka na soon, get NBI when you get the time na kasi medyo hassle and matagal processing nun.