https://www.galvnews.com/news/galveston-appraisal-district-begins-mandated-homestead-audits/article_0e7f2b6e-5b08-5a2b-ab72-d7ec9e2b7a4f.html

These will be completed in phases, everyone will receive the notice but not at the same time. Reviews for all claiming the homestead exemption will be completed every 5 years.