"Following the extension of the State of Emergency in Thailand to July 31 the 60-day “Covid” visa extension application date has been extended by an additional two months. The deadline was originally scheduled on May 24, but Thai Immigration discreetly updated the date to July 25. (as they have continued to do in the past)."
Source: https://thai.news/news/thailand/july-25-is-now-the-last-day-for-covid-visa-extensions