It would be useful to know when a page was generated to see when the content had last changed. It is especially useful if deploying to an AWS S3 bucket, which may not propagate to CloudFront for some time; the date would be an indication of when the page eventually gets propagated.
See Is there a standardized (meta?) tag for the date of a website? for ideas on which metadata name to use. Some standard URF property may be appropriate.