I filed my i765 after I filed my i485. I already received a biometric appointment for the i485 before I filed for a new EAD i765.

Would I receive a separate biometric/finger print appointment for the i765 or will they just use that of the i485?

Also does anyone knows the current actual timeframe for EAD? I filed with the Texas Service Center

Yes, each time you do a transaction with USCIS you usually get a biometric appointment. Time frame is several months.