I was hoping to stay in thailand for 90 days but im still waiting for my tr (60 day) visa to get approved and sent and then extend by 30 days while out there.

If I don't get it in time and just go on my passport visa exemption I know I can get an extension and stay for 2 months but is there any way of staying for 3 months by doing a visa run to Cambodia or getting a covid extension.

All advice is appreciated. Thanks in advance