H1B Petition Location Update Required

Hi Team , My H1B petition was filed for Chicago project this year. My petition is approved now but however my Chicago project is going to end soon and a new requirement is coming in Phoenix, Arizona.
At present my visa is not stamped . May I know what all steps my organization need to take?

I am keen to travel US soon so I am keen to know how much time it will take for location update?

Regards,
Rahul