From the website:
Processing times vary by applicant, but on average you can expect your application to be processed as follows:
Global Entry: 4-6 months
NEXUS: 12-14 months
SENTRI: 10-12 months
FAST: 1-2 weeks
I have no idea how current that info is. My neighbor works at the Whirlpool bridge office, so I know for a fact what he told me is current.
The best way to deal with the Global Entry interview backlog is to ask to do you interview when you’re coming back in from an overseas trip. I couldn’t find an appointment time, so I just asked when i got to US Customs and they took me aside and did the interview right there. Got my updated card in the mail a week later.