IN EV Theory, you are not supposed to hedge your bet like this, you are supposed to just make it a 5 team parlay and leave off the SF game if you are thinking of taking a guaranteed win like that. In the long run over many bets, you make more money by letting the parlay ride.
Now, in Reality, it really depends how badly you need the money. If you really want that money for a BR or it makes a significant difference for you to perform online, then yes, take the guaranteed money. Of course, you can make the amount lower than $50 so you are guaranteed something, but if your win comes through you make more money.
Congrats on picks and good luck whatever your decision. (Have I hedged before--YES, when I really wanted to lock in the money)
Should You Hedge Your Bets? Not If You Want to Maximize Profits
Hedging your Bets