Your right in the middle of the RP drink range. I would open it 3-4 hours ahead and put it in a decanter. Watch it change, this is one of the pleasures of watching a great wine change in the glass.
It is drinking ok but isn’t life altering. When in doubt, open a few hours before, try 1 oz, if you like it recork and stick in refrigerator. If you don’t decant, try every hour until you like it, recork and stick in refrigerator.
The 1992 can be popped and poured. It isn’t closed. Will it benefit from air, most likely.
Now wait a minute… I was under the impression you had the one bottle of 1996 only. And thus were really agonizing over when to drink your “only bottle of grange”… I got suckered
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