I did a quick check using some of the examples.
ListPlot[ParallelTable[
Total[FactorInteger[2^i - 1][[All, 2]]], {i, 150, 300}]]
is working (the example had limits {150, 190} so I increased it.) Activity monitor shows 4 threads of WolframKernel running at 99.9%,
The function is still processing -- I should have made the upper limit something more reasonable -- but it is sufficient to say that ParallelTable is working. With the example limits, it returned relatively quickly.
Running an iMac (2017) with a 4.2 GHz Intel Core i& and 32 GBytes RAM.