What should I do if my 60-Day Tourist Visa application is still processing before my flight?

You get 45 days exempt and can extend for another 30 days = 75 days as you don’t want to leave the country bite the bullet and forget your 60 day visa

Mine took 1 week for them to ask for more info.

Re Submitted on got the visa tr60 5 days later.

USA

DC embassy

I submitted this as a post last month but wasn’t approved

If the visa isn't approved by the time you fly here, you can come in on a free visa exempt entry stamp (which is now 45 days)

and

if the visa does get approved once you're here you can print the PDF eVisa file, stamp out of thailand, stamp in&out of another country and then stamp right back in to thailand showing them that PDF at passport control and you'll get stamped in on that tourist visa for 60 days.

Remember a tourist visa is valid for 90 days from the date it's issued <- that means you have that long to enter the country and get stamped in for the 60 days you're allowed on a tourist visa.