Using tabadmin commands you can get the information.
tabadmin licenses -p
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Each core count as 1, knowing it does not take into account Hyper-Threading cores.
For example, if you have 2 CPU with 6 cores each, and Hyper-Threading (HT) activated, in other words 12 Cores, 24 Logical Processors (thanks to HT), you'll need a Tableau Server 12-core license.