Process of SSDI backpay, after local office finishes SSI offset. Disability

I know people ask alot of questions concerning backpay, apologies if this seems redundant.

Originally filed for SSDI in 2019, was told I didn’t have enough work credits (the local office was incorrect). Went forward and applied for SSI years later, approved.

I had my 2019 SSDI case reopened, ALJ fully favorable decision in December 2024. Judge said my case would be expedited because of the prior mistake.

At this point, I’m about to receive my 3rd monthly SSDI payment (still receiving very small amount of SSI), but the local office still hasn’t figured the SSI windfall offset amount for the Processing Center to proceed.

Called the 800 number, they verified that the local office calculating the SSI offset has had messages sent to them from both SSA and the Processing Center as a “whistle” that they are requesting that info to wrap this up.

Question: Once the local office FINALLY gets the SSI windfall offset amount figured & sent to Processing Center (who already has their numbers ready & waiting on offset amount), how much longer should the process take to receive the SSDI backpay?