When to "mark as shipped"

Hello all,

This is my first time selling on Amazon. I dropped of my box at UPS access point (a small hair shop). The lady there told me that UPS will pick up the box in the afternoon. I just input my tracking number on the UPS website and it says my package is “in transit”.

Should I “mark as shipped” or do I have to wait for UPS to email me/ give me a new tracking number?
Somebody please explain the process as well.

Cheers