Hi and welcome! (I'm new here too, but welcome anyway!)
You'll find a ton of great info regarding how much you can expect to take off MSRP, incentives, negotiation, etc in this thread. Good luck with your buying!
In this case, you've got $57020 MSRP:
Invoice can be calculated at appx 92% of MSRP. (Try building the truck on Edmunds.com; it will give you some numbers too)
(($57020 MSRP - $1695 Destination Fee) x .918%) + $1695 Destination Fee = $52,483 Appx. Invoice.
So, your dealership looks like they're ~ 1% - 2% under Invoice before rebates (pretty good). Using Appx. Invoice (not your price), subtract rebates $3000 = $49,483.35.
Add in other fees. Then multiply by Texas sales tax (6.25%) = $52,576.06, then add any non-taxable fees (registration / plate). That's your OTD price.
In order for your OTD Price of $46K: you'd need the Dealer to come down to 5% under invoice (Employee Pricing) and give $6500 in rebates.
To give you an idea of other dealerships, two site sponsors, Koons and Criswell, offer some solid deals. With your $57K MSPR, $3K incentives, and their deals, you're still looking at $48K - $49K OTD.
I'd suggest building an excel sheet with all of this programmed in. If you go to a dealer with this programed into excel / google sheets, you can do this on the fly and negotiate with the dealer.
Hope this helps!