TimePicker is built on DatePicker and reads DatePicker's component tokens. Set them under components.DatePicker, or in the token file your theme is generated from.
There is no components.TimePicker. A token set under components.DatePicker changes every DatePicker and TimePicker under the provider. The DatePicker page's Tokens tab lists them.
Global Tokens
The global tokens TimePicker reads. Set one under components.DatePicker to change it for DatePicker and TimePicker only, or at the top level to change every component.