Bayesplot: How to get probability of effect sizes bigger zero

I have a presumably very basic question: In the summary of a a stan_glm in bayesplot I can see the estimates of mean and CrI and so. Now I also want to repot the probability (beta) of effect sizes being bigger than zero; i.e. where is the distribution cut by the zero?
How can I find them?

Thanks a lot in advance!


Those are posterior medians and standard deviations.

colMeans(as.matrix(fit) > 0)

Thank you! Works perfect. The command print() gives indeed medians and sd, but summary(fit) posterior means and CrI. Or did I understand something wrong?

Best, Martin

Yeah, summary produces all that.