H4 Visa for my family


I am in USA with my H1B just got completed 1 month. Waiting for my employer to file Amendment for my new client. I plan to initiate H4 visa for my wife and child.

Shall i initiate H4 visa for my family with my current H1B petition or wait for employer to file Amendment and then initiate the H4 visa?

My current petition with Pleasnton, CA
New job location: Los Angeles, CA

Please do let me know your suggestion for my case?