Unfortunately there is no way to see a print preview with CPCL language.
You could use ZebraDesigner tool to have an idea of the label design before to print, but you need to design the label graphically. ZebraDesigner does not import CPCL code.
Zebra supports CPCL language as a legacy language, but Zebra is not adding new features to it.
You could eventually see a print preview if you use the ZPL language, which is the recommended printer language by Zebra.