Hey Scotty, Happy Friday! I got a new 12V Car Battery a week ago and left it on a trickle charger for a week until I have a chance to replace the one in my engine bay. My question is the voltage reads 12.97V is that considered a fully charged battery and if I leave it on the trickle charger it wont overcharge correct?

yes, that should be fine and leave it on the trickle charger, it harms nothing and actually benefits the battery