Congratulations on your teaching contract and moving out to live on your own! I hope you get a permanent post soon.
I'm not going to tell you what to do, you seem happy with your life so why worry about making a big show of leaving the JWs. Hopefully your life will simply move on and be filled with your job, enjoying your new home and the new friends you will make from your job. It will happen naturally.
Either your JW friends will drop off as you do less in the religion or they will stick with you. No need to make a big deal with your parents just take your time.
You say you know you need to make that final step but nobody here is telling you to do that. Do what makes you happy.