m0useanswered grow question 2 years ago If its on its 4th week in flower its half way done, normally 8 week in flower for an auto and 4-6 weeks in veg.
I would not yet do water only. save that for the last 2 weeks if you feel like it. I do not use this practice myself.
If your diary weekly updates are not accurate then I would chop whenever it is telling you its ready.
Good Luck!