We also did a lot of detangling before this, and are also on the cusp of transitioning to living apart, for a host of reasons not related to sex or polyamory, and not related to problems in the relationship. Perhaps in some other thread I might go into those things.
This seems quite key, actually! You said you have a couple dozen animals, even ducks, which indicates a pond and an actual farm of some kind... Yet, you and Wife are not going to be living together? Who is staying at the farm and taking care of the livestock, you?
Will Wife be living far apart from you? Does her potential bf live close to both of you now? Will he still be close to one or the other of you when one or the other of you move?
If you and Wife are going to be living apart, and she has her own place, it might be possible there will be nights she is spending neither with you OR her bf, right? After all, most of us have work, family, friends, as well as activities we do that do not involve anyone at all besides ourselves.
A typical calendar for a poly person is, 2 nights with one partner, 2 nights with another partner, one "me night," one night for friends, and one night left open for unplanned-for happenings.
And if your wife is going to be living alone, and you are too, don't forget that there might even be a week where you don't want to see anyone! haha! Maybe you're sick, or tired, or deeply involved in writing a book, or studying for a big exam, or whatever the heck. Maybe you don't want to see any partners at all because you have an old friend in town for a week and you want to be just with them.
In my opinion, part of the joy of living alone is being your own boss, and not having to get anyone's feedback on how your spend your time, sometimes.
And part of the reality of poly is, one becomes more independent. Mono couples can be very codependent. Some do literally everything together, as if they were a unit, with neither person having their own will or ability to act alone.
Poly people make choices for themselves (after negotiating with their partners). And some day or nights, both of one's partners may be busy with others (lovers, platonic friends, family, on a trip, whatever) and we may left to our own devices entirely. We need to get OK with this.