Delaware Tax Clearance Letter – Real Closing Timelines?

I’m in the closing couple of weeks of an SBA-backed acquisition and the bank is requiring a Delaware Tax Clearance Certificate from the seller’s LLC. I’ve seen the official guidance that it takes 3–5 weeks and only submitted by mail, but I’m wondering what the real-world timelines have been for those of you who’ve actually gone through this process. Does using a Delaware-based CPA or attorney who can hand-deliver the form speed things up? Did your bank require just Delaware clearance, or also a Washington (or other state) clearance if the company operates outside Delaware? I’m trying to avoid delays at closing, so any insight into actual turnaround times (vs. what the state publishes) would be really helpful.