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What does instant mean in a relativistic universe? Does it imply there is a simultaneous now for both entangled things?

It would imply faster than light communication between particles, but as someone else said, models are only models. Faster than light communication is impossible for us to achieve, no reason to assume there's not a way that's inaccessible to us.

It's not the speed I am interested in; it's that relativity says there is no such thing as a simultaneous now (for things in different reference frames anyway).

Sight correction, at least in my understanding (physics major but only undergrad) this explicitly isn't communication.

It's not possible to use entanglement to transmit information faster than light, even though the entanglement itself could be simultaneous.

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