Hi

Can you add page number in the timeline so it is easier for my boss to give feedback?

Or maybe to see the exact time when she use the "preview play your scribe" button? 

It's not possible to add a page number to elements in the timeline but you could add a text element at the beginning of each scene containing the scene number.

If you are using 'Preview play from here' to play the scribe from a particular element in the timeline, the start time of that element is visible before pressing play when the element is selected.