Much further than that. At least 200nm using drone ISR to cue Shaheeds, 500nm with satellite ISR. (With a 90kg warhead.) There are also many fishing vessels in the region, originating from a number of countries (e.g. Oman, Iran, Pakistan) which can report sightings of VLCCs.

Once you have sighted the ship it is an undergrad project to implement target classification and recognition using off the shelf algorithms. It doesn't need a fast GPU because naval engagements are very slow, a cheap mobile phone can do it.