I'm an 2017 iMac as well, use it every day for work and personal stuff... sometimes literally hammer the stuff and my numbers look nothing like some the other ones displayed here... bit of a shocker.

   === START OF SMART DATA SECTION ===
   SMART overall-health self-assessment test result: PASSED
   
   SMART/Health Information (NVMe Log 0x02)
   Critical Warning:                   0x00
   Temperature:                        36 Celsius
   Available Spare:                    100%
   Available Spare Threshold:          10%
   Percentage Used:                    1%
   Data Units Read:                    27,459,395 [14.0 TB]
   Data Units Written:                 34,559,091 [17.6 TB]
   Host Read Commands:                 864,546,880
   Host Write Commands:                1,257,234,100
   Controller Busy Time:               3,486
   Power Cycles:                       4,595
   Power On Hours:                     1,882
   Unsafe Shutdowns:                   74
   Media and Data Integrity Errors:    0
   Error Information Log Entries:      0
   Warning  Comp. Temperature Time:    0
   Critical Comp. Temperature Time:    72858