I applied January 26th, 2018 and received my Conditional Approval notice online Today February 28th, 2018. Furthermore there are plenty of openings at my local Enrollment Center in Downtown Detroit starting tomorrow (and pretty much every day after has multiple openings).

Welcome to FT. You are fortunate to be near a NEXUS interview center with immediate availability.

Applied Online: January 24, 2017
Conditionally Approved: February 26, 2018
Interviewed: March 9, 2018 (scheduled)
Approved:
Card Arrived:

Lots of openings at the Fort Erie location, if it had worked for my schedule I could have scheduled it for the next dayd

Applied online: Feb 13, 2018
Conditionally approved: March 20, 2018
Interview: March 22, 2018 (scheduled at Niagara Falls location)

There were a lot of middle of the week appointments available at Niagara. Does anyone know how quickly we get our Known Traveller Number? Do I have to wait to get the physical card, or is it updated on the website as soon as you get approved?

Also, the CBSA have updated their published wait times to 20 days (as of 2/28/18)

You should already have it, it is listed as PASSID

Applied Online: Feb 8, 2018
Conditionally Approved: March 13, 2018 (23 days)
Interviewed: March 20, 2018 (YUL)
Approved: March 20, 2018

CBP officer told me I should get my new card in the mail in 3-4 days as I live in a state near the card production place.

Applied Online: February 13, 2018
Conditionally Approved: March 20, 2018
Interviewed: March 21, 2018 (YYZ)
Approved: March 21, 2018
Card Reported Missing: April 17, 2018
Card Re-mailed: April 18, 2018
Card Arrived: April 24, 2018

When I was approved on March 20, I immediately went online to find the next available appoint, which was in Fort Erie on March 21. However, late last night, I checked availability again and there was an opening on March 21 in Mississauga (YYZ) so I switched because it was more convenient. Also, when I checked availability initially on March 20, there was availability through 6.45 pm on that day (same day as conditional approval).

The officer said that my card should arrive in 2 weeks.

I have just received my NEXUS pass after a long wait. When crossing the Peace Bridge using NEXUS, do I need to carry/show my passport along with my NEXUS card every time?

After receiving your NEXUS card, you need to activate it within 30 days. When you cross Peace Bridge using your NEXUS card, NEXUS card is sufficient. I do carry my U.S. passport with me just in case.

UPDATE:
Applied online: Feb 13, 2018
Conditionally approved: March 20, 2018
Interview: March 22, 2018 (scheduled at Niagara Falls location)
Approved: March 22, 2018

I had by email by the time that I finished getting my iris scanned at the Canada location. Was told my card should arrive in 7-10 business days in a plain, unmarked envelope.

Applied online: Feb 24th, 2018
Conditionally approved: April 4th, 2018

Interview scheduled in Seattle for August 7th

I gave my NEXUS interview at a land crossing one day ago. Every forum I look, people get their approval email immediately or within a few hours. Has anything changed between 2017-2018 that approvals now take longer? I think my interview went well, the CBP and CBSA officers were very friendly and I honestly answered all their questions and had all documents ready. My record is clean and I'm a law abiding resident. I am a US visa holder and a Canadian PR, currently living in US till end of this year.

Timeline: Conditional approval: March 14, 2018
Interview scheduled for June Seattle Boeing within 30 days, then rescheduled to Land crossing: April 5 2018: Interview done.
Approval email: No email confirmation yet (April 6, 2018).

Note that my land crossing Nexus office is only open Tues and Thursday.

So you got the approval email two days after you gave interview? The location you interviewed at, is it open every day? I gave my interview at a land crossing yesterday and still haven't received email. The land crossing is open only Tues and Thurs. Maybe my interviewer also forgot to click on Approve :(? I will wait for a few days and see what happens. My interview went well, no hiccups so I don't see why they won't approve me.