VIC Queries regarding financial binding agreement in Victoria

[Ven55]

Hello,

I have a financial binding agreement with my wife that was made after independent consultation.

• It states that each of us cannot claim anything from the properties that we had before marriage.
• Each of us is sharing living expenses and will not claim anything from the other party in case of separation. It details all properties, bank balance, mortgage, and assets.
• It states that the shared property would be sold and the outcome would be equally distributed. Each of us is paying equal share of its mortgage

Since then- we have sold one car and purchased another. Bank balance also got changed as its been 4 years since we got that done. Other than that, there are no changes such as no children and no new properties.
Questions-
1. Would it be still valid in court, in the case of separation.
2. In general, when a mutual financial binding agreement is there, how likely the court will accept if a party challenges it and demands money/property/alimony from other.
3. If I have to buy another property, and I get another binding agreement listing that, would I be risk free in case of a separation?

If I have to consult a professional lawyer, what would be the charges? Also, charges for making an updated financial binding agreement.

Thanks for the help.