ensure all workers participate in the threshold timestamp calculation… #744

Job	Run time
test-macos / Build packages (3.10, ec2-macOS)	29m 8s
test-macos / ec2-macOS pytest	8m 23s
test-macos / ec2-macOS pytest	7m 30s
test-macos / Notify_on_failure	0s
	45m 1s

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