It’s already pretty close to being safe, and probably not harmful to most living things at this point. Still, I would give it one more day to let things settle a bit more before doing anything. That way you’re not disrupting the system while it’s still balancing itself, though I would also not hold back for too long from this point on.
I would also test your phosphates now. The presence of nitrate is reassuring, but phosphate may still be elevated.
I would also test your phosphates now. The presence of nitrate is reassuring, but phosphate may still be elevated.