Reinstatment timelines and process Qs

I’m coming up on 24 months since being debriefed and administratively downgraded from TS/SCI with Full-Scope poly. Presently hold an active secret clearance, and looking at a couple opportunities requiring SCI+Full poly. With just over a month to go before the 2 year anniversary, what should I be asking employers to ensure it gets reactivated before it’s no longer eligible? My most recent PR was completed in March 2013.

What is the process and timeline for reinstatement? One thing I’m aware of that will help is having the SF-86C information ready. Any other advice?