When can I applyfor Family Unity provisional Waiver Process?

The new rule goes into effect on March 4, 2013. No filings will be accepted before that date. You can only apply for a provisional waiver after an I-130 (or in some cases, an I-360) immigrant petition has been approved. If you haven't filed (or gotten a decision on) a petition, you will have to file a petition or wait for an answer on a pending petition. There is no concurrent filing.