Ditto what
@salcoco said that you should get local zoning approval first if you are not using a building already zoned commercial. The TTB licensing is straight forward. Took me under 5 months to get approved. State was a few months.
The business plan is the key. Otherwise a winery is a money pit. I've known a small number wineries that went with distribution first. Most open to the public. Distribution is difficult due to the tight margins. Remember that you will be in competition with Gallo and large wineries that have the economy if scale you don't. They can sell wine to distributors for under $4 a bottle. I can't even make wine for under that.
Going for open to the public first means having significant staffing cost and having a property in reasonably close proximity to a population center.
All depends on your scale and plans. Good luck