Help with Delta method and average survival estimates

Hello,
We would like to use the Delta method for calculating average survival estimates, standard errors, and confidence intervals from our model in RMark, but we are uncertain as to how to write the script for it.
Thanks for any help!
We would like to use the Delta method for calculating average survival estimates, standard errors, and confidence intervals from our model in RMark, but we are uncertain as to how to write the script for it.
Thanks for any help!