You can't approximate the yield, but as far as being more than an appropriate, you are out of luck.
I've seen charts on yield over the life, but not weekly or even monthly.

This is a hard topic that I struggle with and the main reason why I refuse to setup a CSA and why I no longer seekout restaurant sales . I really enjoy the aspect of taking what I pick to markets and laying it on the line. I have a hard time even predicting when wholesale quanities of most crops will be available to regular customers because that means that I take a potential loss on my retail sales.

There are far to many variables involved in making even a reasonably accurate prediction but usually for crops that have an earlier fruit set you can make an educated guess. Sorry I can't help more.

if you have a big cooler you don;t need to predict but just make your harvest day 5 days before you have to deliver.

Well, if nothing else it's good to know I'm not alone in struggling with this.

I would say though that at least it's fairly easy with crops like lettuce where the whole plant is harvested and "readiness" is mostly determined by size.

And it is getting easier for me to take note of how many young fruits are on fruiting plants as I harvest and think about whether these will grow to full size by next harvest.

Randy that's true about having a cooler, though I feel that one of my sales advantages is that my produce is really really fresh - usually sold within 24hrs of harvest.