tfm list workspaces
tfm list workspaces will list workspaces by default of the source TFE/TFC instance.

--side flag
Providing the --side destination flag will list workspaces of the destination TFE/TFC instance.

--json flag
Providing the --json flag will output information about the workspaces in JSON format to make configuring the tfx configuration file more managable and assist in automating tasks.
