If you're in Phuket and haven't gone to immigration yet, you need to go today! They're giving out numbers for appointments in advance. I arrived at 9am and after my documents were approved, I was told to come back 11am Saturday.
TLDR : Answer Summary
If you're in Phuket and need to attend immigration services, make sure to go today as they are currently distributing numbers for future appointments. One user reported that after arriving at 9 am and getting their documents approved, they were instructed to return at 11 am the following Saturday.