Image profiles can be exported to ISO or offline bundles (.zip) using the Image Builder CLI. Although the GUI method is more intuitive, it is handy to know the CLI method. The commands syntaxes are:

Export-EsxImageProfile -ImageProfile "<Profile Name>" -ExportToIso -FilePath "<Destination hard disk location for the ISO>"
Export-EsxImageProfile -ImageProfile "<Profile Name>" -ExportToBundle -FilePath "<Destination hard disk location for the .zip file>"

Here is an example: