I did my interview for combat engineer on march 24th and was put on the merit list sometime before April 25th. I'm still waiting for my call too.
My advice? Don't worry about when you'll get the call. Plan your life as if you never get that call, once that is done figure out what you'll need to do if you DO get a call to be ready to go to BMQ on a moments notice.
That way you're prepared if you don't get a call this year (crappy thought i know), then if/when you DO get that call it'll be so much easier to get your ducks in a row and you wont feel too rushed to get everything ready for BMQ.