DOJ waiver based on my TS

Since I already have a Top Secret Clearance and I got a job offer with DOj , do you happen to know how long I have to wait for the DOJ waiver to come in based on my TS?

What waiver are you referring to? If they see you are currently cleared at the TS level based on a within scope investigation then they should be able to accept reciprocity and proceed with on-boarding.