Due to the recent implementation of the topbar, the review numbers have been removed for 10k users. After seeing this request to have the feature back, I decided to create a custom script.
Don't like your green rep notifications?
Hide them completely with Banana Stand:
Banana Stand User Script Download Link
Alternatively, make the less intrusive with Banana Stand Lite:
It's the extensible userscript for customising that almost-black bar at the top of your screen.