The TTB has ceased most operations due to the lapse in government funding and will not be accepting, reviewing and approving label approvals (COLA).
Some “excepted” functions will be operational, including the web site electronic payments function and access to online permits review. The TTB web site will not be updated. No personnel with be available to respond to any inquiries, including emails and phone. TTB employees have been directed not to show up to work and are prohibited by federal law from volunteering their services during a lapse in appropriations.
The compliance company Compli has a blog post here on best practices during the shutdown.