Question on h1b approval - Biometrics notice for H4 meaning approved?

Submitted a h1b transfer + h4 in premium mode to vermont center . Received receipt notice on July 26th and its pending with USCIS . But my wife received boimetric appointment letter in mail on 8/5/2019 , does this mean the H1b transfer request is approved ?

not necessarily …

No, Biometric is just part of the H4 process, has nothing to do with H1B. Read New I539 Biometrics Process. You need to get H1B approval notice for approval.