If I were you I’d wait at least until October, Phuket is not the place to vacation as there is no transportation out, by air, sea or land only by cab, which costs a fortune, check Thai websites for updates, which changes almost daily
Hope you get your visa stamped by immigration before you leave, otherwise they’ll get you for overstaying and will get a fine and will not allow you entry to Thailand, also you’ll be unable to return for 1 year. Happened to me 2 years ago