Applied in February 2020 for my Thai fiancee. We finally received our NOA2 July 15th. January 28th our status was set to in transit.
According to the Thai US immigration Facebook group the Thai embassy is fully booked for March. Cases are not being opened and set as ready in order of NOA2. They seem to be opening packets randomly and setting them as ready.
The process is frustrating and little communication through the entire process. If you email the embassy you get a copy and paste response.
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source https://www.reddit.com/r/immigration/comments/lyvoxq/k1_in_transit_for_over_a_month/