My refund was approved with a DDD of April 30. I had TurboTax take their fees from my refund. When will I actually receive the funds? I used my Venmo account

Does the IRS refund site show a refund date of April 30?   The IRS refund site is the only reliable source of information for your refund.   Do not rely on the "estimated" date that you see on the TurboTax site.   If you chose to pay your TurboTax fees from your federal refund, your refund goes from the IRS to the third party bank.  The third party bank takes out the amount you owe to TT, keeps the $40 ($45 in CA) refund processing fee for itself, and sends the rest of the refund to your bank account.

First you need to check the IRS refund site to see if your refund was issued, and look to see how much they issued.

https://www.irs.gov/refunds

Your tax refund was not sent to TurboTax.   TurboTax does not handle your refund at all.

Santa Barbara Tax Products Group, LLC  (SBTPG) is the bank that handles the Refund Processing Service when you choose to have your TurboTax fees deducted from your refund. This option also has an additional charge from the bank that processes the transaction. 

You can contact them SBTPG, toll-free, at 1-877-908-7228 or go to their secure website www.sbtpg.com 

How can I see my TurboTax  fees?   

https://ttlc.intuit.com/turbotax-support/en-us/help-article/intuit-account-billing/review-fees-turbotax-online/L1XnIzgzg_US_en_US?uid=m682vq7k

What is Refund Processing Service?