Lonewolf, if you are an ETL there is a link in workbench, I believe you first have to take a few courses on it before the access is given to you. Once granted you can set up you're smartphone or via the same link to go to e-hr via target.com
Personally, I have made several attempts to set up my email on my smartphone. It has nothing to do with working off the clock. I hate when I have 15+ emails to catch up every day and there isn't a single computer available. I'd rather just quickly go through each of them after I clock in. I'm sure I could put a setting to only give me notifications during certain hours. I was never able to figure it out, though.