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I would like to track the build time of Pex targets for my pipelines, is there data I could export to do this ootb?

You can collect trace data with <https://github.com/shoalsoft/shoalsoft-pants-opentelemetry-plugin>.

(or write your own plugin to collect the same underlying "work unit" data)

Looks very useful, do you use this yourself?

I’m the author. Just set it up on Pants CI this week or so. 

Brilliant. Could I use this to also track test run times?

Only at the coarse level of the monitoring the test runner process (e.g, `pytest` ).

For individual tests, you should use the `--test-report` option to get `junit.xml`-style outputs. <https://www.pantsbuild.org/stable/reference/goals/test#report>