The absolute minimum according to theory, is two samples of the highest harmonic of the waveform you’re interested in. There are rules that give limits for the amplitudes of the harmonics that are permitted - but those tend to be based on the harmonic number and the total load, so there’s no clear answer. I think most electronic meters go up to at least the 30th, so in excess of 3000 samples per second. See: Sampling rate of emonLib
Bear in mind, that still needs a decent ADC to get digital numbers into your RPi.
OK, but you must check the part number, because your description and the part number you gave don’t relate to the same thing.
And there are two of those in the SCT-013 family - one that outputs 1 V and one that gives you 50 mA at your 100 A.