I want to show to my team members and other users when the dashboard is refreshed last time.
Please suggest how I can do it?
You can utilize a single value text card with your data source and select the maximum timestamp of your dataset. You'd just need to make sure to include your timestamp in your dataset. You could utilize a dataflow to add the current date time as a timestamp for when the dataset is updated.
Alternatively, you could utilize the Domo Data Governance connector to pull the DataSet information which would have the "Dataset Last Updated Date/Time" field which would contain when the dataset was last updated prior to this governance dataset updating. This would mean if your dataset updated after the governance dataset is updated then it wouldn't reflect the correct last updated date and time.