His retirement status is an issue here. It is relatively unusual for people to be able to retire in their early 50’s, unless they are in a high value job. It is common amongst front line workers, police, army, medical staff and fire. There is usually a strong case for them to be declared medically unfit to work. They often have access to advice and support about all thing divorce linked to their profession and pensions. They protect their pensions. How old is he now?
Age disparity and any health factor that would stop him working is going to make the divorce complex. He is potentially the low earner with limited ability to improve productivity or earnings.
In terms of your children. One will presumably be taking exams this spring and after that will leave school. The other will be taking exams at some point over the next few years. Legally there is a case to be made to avoid disruption to their school education. Which can mean house sales are deferred until the exams are over.
You say he seems ok with the idea of deferring a house sale. This could be good for the children. It could also be good for him. It may not be good for you in terms of the settlement you end up with.
The older he gets the more likely he is to argue that he needs all or most of his pension and he needs an equity share. Basically if he is prevented from working ft or at all, he cannot maximise his income or build a pension. His needs increase.
meanwhile your needs decreases. Once the youngest reaches 18 and leaves school they are no longer a dependent. Your needs become a one bedroom flat and you have the potential to improve your income and pension provision.
None of that might matter if your have a lot of wealth and a high income. You could still be able to afford to house and fund your children’s university.
So to answer your question, the ducks in row is not just about knowing your marital finances (this is were you disclose assets and liabilities) but also thinking about timings and leverage. His personality and behaviour also play a part.
Once you know this you can strategise how you approach the divorce. Being confrontational isn’t always the best approach especially if you have a lot to lose and not a lot to leverage.
in your OP you state that you priority is financially supporting your children through university. But this isn’t a legal entitlement that can be enforced. You have no leverage on this point and you need to think about how and if he can be influenced to support you on this.