Adjustment of Status - I-485

Hi guys, this is my Process Time:

12/16/2016: Documents Submitted

12/21/2016: Documents Received by USCIS

01/21/2017: Notification for Fingerprints

02/03/2017: I went to take my Fingerprints in Elizabeth USCIS Office

03/01/2017: Case Is Ready To Be Scheduled For An Interview (Since then I haven't got the interview date notification)

04/18/2017: Approved My Form I-765, Application for Employment Authorization (EAD)

04/27/2017: I got my EAD on my Mail! ( I was so happy after 4 months waiting for my work permission)

Now I am waiting to get my Interview date. 4 months and half passed already since I got a notification about my I-485. 7 months passed since I started my process.....Somebody knows how long takes for 2017 cases?

If I am living in New Jersey, I guess my case is in Newark Nj office?

I had been reading other cases, what it is the meaning of PD? (Sorry I am new here)

Thanks! have a nice Day!