In the medals page at the bottom there is a progress status for all the upcoming merits.
"Reach level Ninety (87/90)
"Commit 9000 GTA crimes (8576/9000)"
And so on...
But the networth ones don't have this progress, it just says: "100% Maintain a Networth value of $25,000,000,000 for at least 112 days"
Well in smaller networth values is fairly easy to check in personal stats how many days are left, but on bigger amounts the graph isn't enough to tell exactly what was the first day you surpassed the 25B (for ex.).
My suggestions is to put a line of text with 85/112 days
I think this would be a fairly simple thing to add, all the data is available.