How long for the GC after getting the EAD ?

[Karu Aiyya]

Filed my I-765, I-140 and I-485 concurrently. PD was 01/22/2018. Got my EAD on 06/21/2018.
My category is EB2- NIW, can someone tell me their experience on how long should one has to wait for the GC after getting the EAD in this category ?
Application is being processed at the Nebraska center.

Thank you!