My refund states it was to be sent today but still hasn't what is the latest they will send it out during a day and who can I contact to speak to a live rep?

The IRS asks that you wait up to 5 days from the day they sent it to allow for your bank processing times after that they ask that you call your bank after that to see when it will be credited.https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions