For a court case, the general rules are that the two parties (you and your ex) take the first and seventh house. As you asked the question, you get the first, so your significator is the Sun and his is Saturn - which you already know LOL.
If it comes to a court case, we use the eighth for his legal team and the second for yours. So his lawyer(s) are signified by Jupiter, ruler of Pisces on the cusp of the eighth. Your lawyer(s) will be the ruler of the Second, which is Mercury. Jupiter is actually in the second, and is ruled by Mercury but Mercury is in Sagittarius ruled by Jupiter. Both planets are in their Detriments, so neither can be relied on to deliver a good case. Financially, both you and him will probably be losers. The Sun is applying to a conjunction with Mercury, so you will be getting a lawer and getting one quite soon. I'll ignore the Combustion of Mercury because it's necessary that you get the lawyer and getting one is not likely to damage your case.
But the Sun is in the last degree of Scorpio and is also Peregrine. Again I don't see this as a prohibition, it's part of the process here, as is the eventual Conjunction with Saturn - your day in court, or at least your day hammering out a settlement. But being in the last degree and in the Terms of Saturn is not a brilliant position. The conjunction with Saturn will follow the conjunction with Mercury as Mars is swifter than Saturn and will already have made its sextile and passed on. Again I don't see Mars reaching Saturn first as a prohibition or a negative outcome There's at least one way that it could be positive.
The Judge in the case is signified by Lord 10, which is Venus ruler of Taurus. Venus is in its own sign of Libra and the Moon's next aspect is to Venus. But that aspect is an opposition. That might signify a real problem, though it is mitigated by the Moon being in the Terms of Venus. So don't annoy the judge if you want the case to go ahead.
The separating sextile of the Moon and Saturn is most likely to signify the possibility of an out of court settlement, either before the case comes to court or just afterwards. But, looking at Lilly, there seems to be a need for reception for this, to be facilitated without some form of conciliation from a third party. I can see a possibility for that role, if it is needed. Mars, is the Moon's ruler and the Sun's ruler and is in one of Venus' (the Judge) houses
Given that Mars is in Detriment, I wouldn't say that conciliation will be very good but it might be better than nothing.
Mars is also ruler of the fourth house and the end of the matter. Mars' next aspect is indeed to Saturn, but the issue is exactly how Mars is involved in that end of the matter. So I at least offer the scenario that the Judge is more inclined to support your case than your ex but his support for you is likely to bring problems if it goes to court (oppositions rarely deliver what you want) and a conciliation through the Judge's agent might well produce an acceptable end of the matter.
Sun and Saturn are equally weak by essential dignity, both are Peregrine. The Sun has something of an advantage in the future when it changes signs to Sagittarius, as it will become the day time triplicity ruler. But that again is in the future. At the moment the Sun is not in a good way as it's in the Terms of Saturn. He has something of an advantage there. I'd say there is no obvious winner from this chart. Your best hope is conciliation to a settlement that doesn't involve a court case. That's the best solution for him too, as he is no more an obvious winner than you are.
I wouldn't like to come down on the side of one or other party from this chart. I'd say look for conciliation and an out of court settlement.