Congrats on getting a PE fare to Tokyo
Many of the cheaper discount economy tickets are not eligible for upgrade
Upgrade windows are done strictly in order of status
So yes you would be behind QFWP or Gold in economy (with an eligible fare)

There is a sale on at the moment - depending on prices you may wish to change what you are doing. And many airlines (not sure on QF) use the sale to whittle out demand, and then "may" open up FF seats immediately post sale. So always worth checking often (expert flyer could help here).