When to mark as Shipped

[teenypetboutique]

I have a Custom Made Dog Clothing business and most of my designs have 15 day Handling Time. 

Question, when am I suppose to mark it Shipped? As soon as they pay, yet it doesn't actually ship for up to 15 days?

Because I've been waiting till I ship it to mark it Shipped, obviously I ain't doing it right.

I saw my Summary and I have 9 Late shipping, I was DO WHAT!

So I'm reaching out to ya'll. 

Thanks

Teeny Pet Boutique 

[teenypetboutique]

Thank you!