applied pre-stain/ conditioner
You didn't need to do that unless you'd identified in advance that the wood was prone to blotching. Helping to prevent or minimise blotching is the sole reason to pre-treat wood in this way.
What you've done in this case is partially sealed the entire wood surface (not just over-absorbent patches) which unfortunately means the stain will have coloured the wood much less than it would have otherwise as I think is shown in the photos.
It's impossible to be sure but it looks like the tabletop wasn't adversely affected and you can proceed with finishing after giving the table ample time to dry off.
Remember wood can still be damp even if it doesn't look damp so after wood gets a good wetting with water it's generally safest to wait at least a full day before the next step.
Once you're ready to apply poly
As clarified in a Comment the source of the water was dew. I think it goes without saying but in case not, if you leave it where it is the same thing could happen again the following morning which you obviously want to avoid.
And you MUST have the table somewhere where it won't get damp for the varnishing stage, including during the entire time the varnish is drying. Call it a solid week with a conservative safety margin. If water condenses on the surface when the varnish is still largely wet Bad Things will happen, and at worst it would mean having to go all the way back to bare wood and starting again.