Don't listen to Speedbrake Lever he's on the B767 and has gone a bit potty from too many Colombo turnarounds.
No just kidding he's a good old boy really, we all love him.
On a more serious note, Command is given only on the A320 fleet on a seniority basis. We currently use a "point system" for seniority, based on date of joining, I say currently because I have it from good authority it may change.
To make a long story short if you join now with some good luck and no expansion (which most probably will happen) you are probably looking at 8-10 with no chance for parole. The list right now for eligable F/o's for Command is long and distinguished I'm affraid.