I wouldnt say all your prereques, unless you want to sit around for a year like i did waiting for adcom to tell me if i'm accepted or rejected.
Ideally, you apply the summer prior to your senior year, o fall of your senior year (hopefully most of your prereq are done), so if all goes to plan, you would be in pharm school the following fall quarter. As for pcats, I take them as soon as you can.