Correct. ShutterCount by Dire Studios is a reliable program. macOS only. Most consider the value of having the info is minimal.
If you leave the settings for file numbering at their default: i.e. continuous numbering and not resetting with a new card, and do not manually reset the numbering, or low-level format your card, then the number in the file name in the form ###-#### should be the shutter count. That usually starts at 100-0001 and will go to 100-9999 then start at 101-0001 again (i.e. a counter reset every 10k).
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
04/20/2023: New firmware version 1.4.1 is available for EOS R3
03/30/2023: New firmware updates are available.
2/07/2023: New product announcements!EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM