requires applicants for a visa extension to show proof of 500,000 THB in funds. However, it does not specify if the money needs to be in a Thai bank account or how long it must be kept there.
You can apply starting from October 8. A processing time of 5 working days has been announced for both Hanoi and Saigon. Check their announcement to determine which consulate to indicate when applying, as they have divided responsibilities based on province.