As of VCV Rack 0.6.2c the only legit way to record VCV out in Logic Pro X (or any other DAW) is using VCV Bridge Plugin
VCV Bridge allows audio, MIDI, DAW transport, and DAW clocks to be transferred between Rack and your DAW through the included VST/AU instrument/effect Bridge plugins.
You can check out this YT video - Logic Pro X with VCV Rack
Though, you need to understand that VCV Rack is still in beta version (hence 0.x.x) and Bridge is just a makeshift solution. As this article points out
VCV Bridge is already deprecated, and will be removed from Rack 2.0. Bridge was effectively a stopgap for allowing crude audio and MIDI integration with DAWs.
also from the same article
A DAW plug-in will be launched as a paid add-on, with support for “multiple instances, DAW automation with parameter labels, offline rendering, MIDI input, DAW transport, and multi-channel audio.”
Now if you want to independently record the Rack output, the best bet is using Rack modules available via Rack’s plug-in manager - The free NYSTHI modules for VCV Rack is a multitrack recorder module.
The advantage of using a module for recording is that you don't have to resolve the audio-routing dependencies that come into play when an external piece of software is used and it is less resource intensive.
Though, I'm eagerly awaiting the release of the official plugin, that will sky-rocket the capability of this amazing piece o software!
An update (December 2019) : Record VCV Rack output in any DAW in MacOS