I don't know about myersi specifically, but most CA/SA cichlid eggs become wigglers 3-5 days after being fertilized. What color are the eggs right now? Are they white or are they a beige/brownish color?
Sounds like they're on their way. I don't know if they usually take longer, but that sounds like the normal progression. Hopefully they'll become wigglers within the next couple of days.
There was a thread in the media section a couple months ago from a member that has been spawning them. Try a search for it. Pretty long thread - 7-8pages if I remember correctly.