PP for I-140 is only for your case, it's similar to PERM, no involvement of other family memeber. 

so, the total PP charge is $1225.


You can file your I-485 only when your PD is current, it's going to be current in October (unless the HR 3012 bill would not pass through).

I-140 current timing 3 to 6 months and could take a year too.

PP 1-2 weeks..mine was approved in a day.