Newborn kitten questions

There’s newborn kittens under the house, and the mother is somewhat feral. I can’t see the kittens from the door, but I can hear them. I’ve been leaving food and clean water for the mother cat.

As the kittens get older, will they walk towards the crawlspace door where I can hold them? If so, when can I expect this? 3 weeks? 5 weeks? (I won’t take them from the mom, as I know they need to stay with her around 6/7 weeks.)