No telling what the debit will be on Tuesday. Currently, I am down just a little bit, so it might be cheaper, making the reward:risk ratio even better.
Depending on where SPY is, you may want to reset the spread differently. I will look at it Tuesday am.
I have a margin account, so I don't worry about it. I am not sure if you need a margin account or not. It is a debit spread, not a credit spread, so maybe not.