Ron, you can buy a small inspection mirror on a telescoping handle and check the weep hole.
But, actually it doesn't matter, the pump has to come off either way. When you get it off you will easily tell if coolant has been leaking out the weep hole - it leaves plenty of residue.
I'm on my 4th water pump on my 300SE (18 years) and I managed to replace it last month removing only the pulleys and the tensioner, and rotating the steering pump a bit. But it's pretty tough to get those rear bolts.

DG