Actually thyme essential oil was one of the things that works against the type of UTIs (Klebsela Oxytoca) my mom used to get but the oils were too strong so we switched to thyme tea that I would make in a crockpot.
It did seem to help with the bladder infections too. Instead of getting positive tests all the time, some would come back negative. Not sure if it would work with the E coli ones but that bacteria stopped showing up as well...at least they never told us it was still present.
When I tried it too, I found it gave me a little tiny boost (rare happening) so started to use it as well.
I use 1 Tablespoon per quart and a half (like liter and a half) of water and let it cook 4 hours til even overnight and then strain through a coffee filter. I pour small amount in a glass and then fill the glass with water and drink.
Ken Lassesen talks about it in several posts on his website, like this one:
https://cfsremission.com/treatment/antibacterial-herbs-for-cfs/
This was a mother of a patient who wrote to him about her daughter's improvement on thyme:
https://cfsremission.com/2019/07/10/user-results-from-new/