...or should I wait til right before?
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HalfPint is a trusted home cook.
You can fry them now. Should they get soften before you eat, just pop them into the oven to re-crisp.
Trena is a trusted source on general cooking.
I'd wait and do it just before. They don't take long to cook and if you want to save time prep everything else. I like to add a nice finishing salt just after I've removed each tortilla from the hot oil. Enjoy!