When is the best time to apply for a COVID extension in Thailand if my current TR visa extension ends on April 30th?

The COVID extension for visas is still available and can be applied for starting end of April, closer to the expiration date of your current extension on April 30th. It's advised to wait until just before your current extension runs out, as applying too early may result in losing unused days on your current visa. Applying in Bangkok after April 16th is suggested for convenience, but it's important to note that some immigration offices may stamp applications as 'under consideration,' requiring a return visit to finalize the extension.