It's hard to imagine adding so much sulfite that you can smell it, how
much did you add into what quantity of wine? It's hard to answer with
any precision without knowing that.

I use titrettes to measure sulfite, it costs around $1.25 to measure
using one. You can't use them if you are color blind and they can be
tricky at first. If you don't use them but have access to a winemaking
shop they will probably do it for you.

Let us know a little more about what you did and the condition of the
peaches and grapes and we can go from there.

Joe