Anyone joining JQ in the recent intake which started 2016 expect to wait well over 15 yrs for a 320 command. As above average age in JQ is early 40s and now they have approval to conduct ATPL flight testing all the cadets will get thier commands in the next 5+ And those kids are mid to early 20s. Wide body for new joiners could be around 10+ in ML even longer for SY or other bases.
My my advice would be apply to QF try that avenue first at least you will have a career there, if not successful try VA new joiners most likely go to ATR but you can transfer and fly other AC with in the company as JQ will be just 320 for the foreseeable future.