Hello,
Even with organic soil, living soils etc it's still important to check and periodically monitor the ph, especially when using bottled nutrients. However with your ph being so close to the 6.0 mark that may be good enough with all the buffering capacity that soil has.
Your plants are looking incredibly well, so I'd just keep checking occasionally and watch for any leaf changes and then if so try to bump up the ph a few points further towards 6.5
Happy flowering. ✌️