“if this receipt is for an I-90, I-485, or I-698 application, the next step is to have your biometrics take at USCIS application support Center. Call customer service at 1.800.375.5283 to schedule your appointment……”. "
In my case, no such a note. So that I did not need to schedule my appointment for FP. But if your I-485 receipt indicated that, I think you should call to schedule your appointment for FP. Do whatever they ask.