UPDATE: After just over an hour, the BTC finally showed as tradable in my Bittrex account.

I immediately initiated a transfer back to USD. Even though the price of BTC had gone up slightly, the buy/sell spread on BTC left me with 1.5% less.

So, the net fees of getting the USD from my bank to Bittrex (via BTC via CashApp) ended up being just over 3%.

So, debit card deposit direct to Bittrex would've been better (and much faster).

Wire transfer seems to be the better way to go. I'll give that a try tomorrow, if I can find time to get that done.