Hi,
if you have already got the AOR from sydney nova scotia then your file is already transferred to CPP ottawa and that is where it will be processed.sydney is only a centralized office once they issue AORs they transfer files to ottawa so your future communications should only be directed towards ottawa and you can only reach them by email there is no phone number or personal visits allowed.
the thing is you can not find out by phone or either email that your ME have been sent because once its sent you will get it in your inbox,they will email it to you.
its only 2,5 months since you got AOR so its still too early to be paranoid,PNP application processed at cpp ottawa take somewhere between 10 and 12 months to be finalized and sometimes even more.
just relax and enjoy summer,you have a couple of months still ahead of you before you become a permanet resident.
good luck.