I got my CNA certificate around July and started to work full time while being a full time nursing student. I am just applying to SFSU's nursing program for Fall 2019. In my opinion, I believe that the CNA experience will help and get you ready for actual nursing. Sure, it is the "dirty work" of nursing but you get so much out of it rather than volunteering. And plus, you get paid!
As of right now, I'm trying to rack up my hours so I have a higher chance for getting into the program. It is hard work but if you keep up with your studies (4.0 student as of right now as well as working full time) you'll have a beneficial experience from it!