Determine Identity of IAM user executing the CDK deploy

I would like to get the identity of the IAM user that is executing the CDK deploy so that I can make that user one of the admins for the KMS Key the CDK app creates.

When using the AWS CLI we can run "$ aws sts get-caller-identity" to determine what IAM user is executing the command. What is the equivalent of doing that in the CDK?

Thank you.