I would not go anywhere near those plants until they are done in case they are being watched, or have motion cameras set up to see who visits them. Put on a ski-mask and all dark clothing with no markings, duct tape on the bottom of your boots and get in and out fast, leaving nothing behind after harvesting in middle of the night. If you must visit the plants from lack of rain, or whatever then make sure you've taken the above precautions as I find it unlikely they'll have humans stake out your 2 plant plot 24/7.
My friend got busted this way once, went to visit his plants a couple days after a copter flew over and noticed some tracks leading up to the plants yet they remained untouched so he assumed it was a thief waiting for them to finish and ignored it and planned to harvest a little early. Soon as he harvested them a couple days later he got raided and had his house torn apart while searching for everything else they could bust him with and they had video proof from a night vision camera showing his face in perfect clarity as he walked up to the plants and they found finger prints on the pots and a tool laying on the ground by them. Luckily it was only a few plants so he didn't get much time. Be careful!
Edit: He also told me the police did not find the other small patch about 200 yards away from the previous one.