The 2018 TurboTax CD should install on any Mac with OS X version 10.12 or later (64-bit).
You can copy the *.tax2017 data file from the old computer to the new Mac, for example with a USB thumb drive.. Then when you start a new 2018 return, you can choose to transfer the 2017 data from that data file into your 2018 return.
Although it's jumping the gun a bit until you get your new computer, here's how the 2017 data transfer is done:
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