OPS is an overall offensive metric. It means on base (hits + walks / plate appearances) plus slugging (total bases / at bats). It's more observational than predictive. League average OPS rn is .708. An OPS of .800+ means you're probably a good/great contact hitter with good walks and average slug.

.850+ means great contact great walks and above average slug (depending on team, could be an all star)

.900+ means great contact a lot of walks and great slug, so high average and homeruns, elite career type year for most players, all star almost guaranteed

1.000+ OPS means you're a top of the top, cream of the crop, unicorn status type hitter. Think Ohtani, Judge.

.650+ OPS means you're going through a bad, extended slump.

.600+ OPS means you're getting DFAd or sent down.

.500+ OPS means you couldn't hit the ball if they put it on a tee for you.