I am not a pro, but I’ll try to help. There may be better ways. You’ll have to play with templating.
You will have to customize the {{ message }} part. Either by looking up where that variable is set (there are a couple of automations that keymaster generates), or by appending/prepending another template to it for the time.
I think something like this would work:
sequence:
- data:
title: "{{ title }}"
message: "{{ message }} at {{ states.sensor.time.state }}"
action: notify.pushover
alias: keymaster_yale_front_door_manual_notify
description: ""
Note - the previous sensor mentioned has to be turned on with the time_date integration. There are a few options for time, date, or time and date that you can pick from or add to eachother to get the format you want for the notification.
Here are a couple places to start learning about templating time and the keymaster notifications:
https://www.home-assistant.io/docs/configuration/templating/#time
https://community.home-assistant.io/t/keymaster-z-wave-lock-manager-and-scheduler/166419/2996?u=cake1468
https://community.home-assistant.io/t/the-epic-time-conversion-and-manipulation-thread/85786/4