Where can I find the total cost turbo tax is going to deduct from my refund?

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

If your TurboTax fees are higher than expected, you can reduce them by removing add-ons     (BEFORE you e-file) :

• Remove Premium Services
• Remove MAX Defend & Restore
• Remove a state
• Remove PLUS Help & Support
• Remove Pay With Your Refund

And if you have the fees deducted from your refund there will be an Extra $40 Refund Processing Service charge (45 in California). So try to pay the fees with a credit card to avoid the extra charge.