Do you mean you need to show the status of the ETL before even login to the application ?
Yes, exaclty, if it's possible. If not, I guess it would be good to put in place a default dashboard with ETL results after user get logged in.
I am not sure if it is possible to display status on login page. But we could put the DAC status in OBIEE dashboard. Please find below Mark's posts on this topic.
Try these options-
1. Manually, developer should be there whenever there is a ETL piece of code is complete and modifying the text everytime .
2.. You can always create a default dashboard with this information once the user logs and see this message and then further continue.
Kindly mark helpful/ answered if this helped/ resolved your query.