Elle, welcome to permies!
I am sure it is possible to have full time jobs and a homestead. We did it.
What makes it difficult is based on what you want from a homestead.
We started our homestead with a garden and a few
chickens. There are systems that will
water the garden while you are at work. There are also systems that let the
chicken out of the house and close the door at night when the go to bed. Our daughter relies on those type systems.
We were also fortunate to have children that had chores to take care of the animals before and after school.
When we started getting more animals it became more complicated. So it depends on how much care the animals need.