When will my milk come in? FTM...

Hi moms! When will my milk come in if I delivered on Sunday?
 I think it's starting to come in because when I manual hand massage I get some liquid that's not colostrum and baby is producing wet diapers. However I don't feel the typical symptoms like engorgement or leaking (my breasts are tender) . 
When will it come in, or what signs should I look for? 

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