In this case we will use the pipeline automation to add tags in all stages of this pipeline.
To add the tag to one or more specific stages, indicate them in the condition field.
In the automation editor add:
The automation title
Trigger: The time of day is >> Specify a time
Condition: The lead has an opportunity >> Specify the pipeline >> If you want one or more specific stages, indicate the stages. In our case, we left it empty to capture all opportunities from all stages.
Action: Modify the lead's tags >> Specify the tag, save the automation
Select yes to execute the automation on already EXISTING OPEN opportunities