eb1doc said:thats correct!
you might have to go 3 times
FP1: is ten fingers
FP2:code2: biometric: index finger plus picture and signature
FP3: includes both.
Previously people use to go for biometric only after I-485 approval but now a days they are taking FP2 well in advance. This is to avoid pasport stamping in future. The moment I-485 is approved your cards will be released second day.