FIRST GROW! Watermelon Auto by RQS

Not much happened this week, and everything went relatively smoothly. The flowers generally became a bit fuller, and the color of the leaves at the bottom of the plants is still a rich green. The plants are still being fertilized and watered as usual. I think the plants actually need another 1-2 weeks, but I'm not sure, as this is my first grow. I'd rather take a bit more time now than harvest too early. This grow has generally been very educational and has taught me a lot so far. What do you think? How long should I wait before harvesting?