Check with your diocese. Some have the list of approved apostolates on line, but if they don’t maybe you could call them. I found this one for DFW, for example:
fwdioc.org/apostolates-list
Also, you can go to the website of most places and find out if they are an approved apostolate. If they have no reference to the diocese where they are from, I doubt they are approved.
Just for kicks, here is the list for San Diego, where you will note this site is listed:
diocese-sdiego.org/Portals/0/content/2015_Organizations_Movements_and_Associations_Feb_24_2015.pdf