The location of the pip indicates that the chick is malpositioned. It may be too big to get into proper position. Be sure the chick can breathe. If it has not hatched by morning, then it would be appropriate to assist. How long ago did that chick pip? How many hours? Has it made no progress at all? If it's been 24 hours, you might want to assess and perhaps do an assist tonight. Is it chirping? has it been chirping? Have the sounds been getting frantic, or weaker? All of these details will help you to know when or if you should assist.