You have the right time frame.
You have done great restoration on the cup,
so you have care for your finds, maybe want to display them...?
Digging bottles, well just use a rigid metal probe to find glass,
then use a hand-sized Cultivator, to reach the glass - don't use bare hands...!
Get majority of dirt, etc out before transporting to home.
Have a box with newspaper handy for all items.
Looks like a good site to dig on.
Good Luck and Happy Hunting...!