Not in plugin manager, in the BROWSER

They are color-coded in Plugin Manager but it is a subtle difference. I think it is a little easier to see in the Browser Plugins tab.
 
I do have a couple of ways to absolutely know if a VST is 32 or 64 bit, but they are a bit programmer-ish. 

1. Use Dependency Walker - drop the DLL on the main screen, find the DLL in the modules list and read the CPU column - http://www.dependencywalker.com/
2. Run a Powershell Script - https://gallery.technet.microsoft.com/scriptcenter/Identify-16-bit-32-bit-and-522eae75

 Neither is exactly user-friendly but they work.
:-)
 

AHA, it's the greenies that are 32 bit!!!
 
Turns out, I only have 5 32 bit plugs and 4 of them are instruments. I say that like I understand the significance!
 
Sound Center
DropZone
RXP
RGCAudio
Bitmeter

My CupCake shows 32/64 bit in the plug-in's property window...