You shouldn't care. If it's degraded you will notice that most of your records would sound dull. Once you change the cartrige or retip it you'll have a feeling of new strings on the guitar.
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I use a microscope and ocasionly inspect the stylus for wear, so far I have had many years of use from my ortofon VMS20E, with no wear to worry about. clean vynil correct setup equals years of use, abuse causes much more damage than wear and tear ever did. Get yourself a small, good microscope, check out a spare cartridge for practice. What you are looking for is two small `flat spots' where the stylus touches the sides of the groove, if you see these develope, it's time for change. You can also check out new styli before use, a chiped tip trashes your precious record INSTANTLY!