I read an interview of a pilot who had flown the f18 as well as the 16 and 15. He claimed that the f18 and f16 could, in a clean configuration at altitude, supercruise.
On the other hand I believe the definition of supercruise requires that you carry a useful amount of cargo/weapons. So simply going supersonic in a clean configuration would not qualify as supercruise.
I wanted to link to the article but I could not find it. I believe it was called something along the line “F15 vs F16 vs F18: A fighter pilots perspective”