Does the 800k Baht requirement for retirement visa renewal in Thailand need to be in the bank 2 months before expiration or 2 months before application?

The inquiry pertains to the timing of maintaining the 800,000 Baht requirement in the bank for the renewal of a retirement visa (Non-O) in Phuket, questioning whether the funds must be present two months prior to the expiration date of the visa or two months prior to the actual application for renewal.