mine was up April 13 and I went today no problem. Depending on the immigration office it is usually 30-45 days prior is okay. I am unsure which for chiang rai.
chiang rai. USA passport. I’m on my final stamp of my non-o ME based on Thai spouse. Actual visa expired in January but this last stamp is until April 13.
Apply for the express Myanmar evisa and you’ll be okay to cross mae sai. It says within 24hrs. So you should get it before they close tomorrow. The border is not closed, you just need a visa.