Typically there is not a delay once the funds are sent from the IRS to TPG, (who handles your refund) the funds are then sent to your bank account (if it is a valid one).If you checked the status of your refund from the IRS Where's my Refund? page and it says that your refund was sent to your bank, but TPG hasn't received and released your refund please be aware that the IRS may indicate funds are available days before they are released to TPG and other banks industry-wide. Please see this for more information: https://help.sbtpg.com/hc/en-us
Here is the link to check your refund deposit: https://taxpayer.sbtpg.com/login.