do you have the top clamped down on the growler or do you have a airlock on it? im new as well, but i dont see any issues with taking the lid of and see whats going on. At this point, theres a possibility that it has already fermented out and the krausen would have settled, but might as well take a look.
possibly dumb question, but you didnt mention that you put the yeast in the cooled wort. Im assuming youve done this, but just want to make sure.