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If you have have an OBD-I car, you need the appropriate Select Monitor to see for sure.
If you have a straight through or loud exhaust you can usually tell, the burble of the engine changes when the injectors are off or on.
I am under the impression that maybe besides some rare cars, that most should have some sort of fuel cut-off on deceleration. I have a SPFI engine in a 1989 Subaru GL that does the fuel cut off. In Subarus the fuel cut-off stops around 1750-2000 rpm from what I have seen. But even then, it is using less injector pulse width than in neutral. YMMV.
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