Changes made to a Pushpage after a job is scheduled, but before that job sends will reflect in the Pusphage job.

For example, if it is 1pm, and you've schedule a job for 2pm - any changes made up until 2pm will still reflect in the Pushpage/Job.

For information on how to send a Pushpage job, click here

Can I edit static users in a distribution group if the Pushpage is scheduled to send?