How soon can you clear CIF?

You still have a responsibility and obligation to train and possibly deploy. You should receive a clearing date and schedule at your PCS briefing. Not before then.

There's almost nothing to clear for a PCS. You'll retain most of your gear.

Read your orders....it should say if you are authorized to report up
To 90 days early or not. If so, talk to
Your COC and see if you can have your DA31 set up to leave early