They are definitely still in the process. Cases from April 2022 and earlier are mostly touched.
- April 2022 is 5.4% untouched ("case received" status*)
- March 2022 is 5.3% untouched
- February 2022 is 3.9% untouched
- January 2022 is 2% untouched
- December 2021 is 1.4% untouched
*which also doesn't mean the USCIS isn't yet working on it! -> it just mean that USCIS hasn't yet changed their status
As you can see, those numbers of untouched cases are VERY low, and some cases just are more complex. Background check can also take longer for specific individuals. So you definitely can't look at all cases as they are the same and they they are "delayed". Everything is moving, some cases unfortunately just take longer, but everyone will sooner or later hear from USCIS.