I sealed all gaps and applied LevelQuik Primer over plywood in my bathroom to prep for LevelQuik RS Self-Leveling Underlayment. I used a small paint roller to roll it on. It has not dried to clear and is still blue but feels dry to the touch. Any thoughts on if I should go ahead and pour the self-leveling underlayment?
You will be fine. Unless you applied it so thick that the very top skinned and sealed the surface so the product underneath is not drying.
Press on the darkest areas and maybe prick a small hole. If nothing seeps out you are ok.
( a secret not spoken of, is that many pros don't use the primer and still get great results.)