That depends on what your CYA level is. You should always post a full set of water test results with questions like this one. It might also help if you kept this together with one of your other topics, so we could see the context of what was happening recently (which can affect things).
With CYA around 20, the FC will be far lower by tomorrow afternoon from the sunlight. Given that you have a plaster pool you should be fine at that FC level for 12-16 hours.
I would take the solar cover off. You want the FC level to come down, since you are at about twice shock level, and the cover might interfere with that.
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