Pharmacy work experience isn't necessarily always positive in the ad-com's eyes. It's nice to have any kind of work experience on your app and maybe some pharmacy shadowing. It's just another way for them to distinguish applicants from each other. It depends on the school, I guess.
The IPPE/APPE course coordinator (one of the interviewers) at my school actually said if it was up to him, he wouldn't admit anyone who has worked in a pharmacy before.😱 In his point of view, people pick up bad habits and he feels like they then have to unteach you things and reteach you the "correct" way (and I use the term correct very lightly here). I'm not saying his opinion is right or wrong and neither is he. That's just how he feels about it. I thought it was interesting that he mentioned that to our class.
Realistically, the majority will usually have some background in pharmacy so it's become the norm to do it and make yourself competitive. It's also natural to want to try something out before jumping in head first and committing 3-6 extra years of your life to education for it.
To the OP, if you are planning on using it this app cycle, then I'd say it's probably a waste of time this late in the game. If you're applying next cycle, then go for it and try to make use of it over the summer or something. Once you're in pharm school (after you get your intern license), you won't need it anymore, so it will be shortlived if you do get it.