what causes the cap on my "must" to not fall after 17 days

[dieseldoc4]

so I started a peach must on 7/20, I had 25lbs of fresh peaches that I smashed with a food processor, 12 lbs sugar, 14 gallons well water, and
lalvin ec-1118 yeast, it formed a thick cap in 2 days, but now it's been 17 days and is not showing any sign of dropping, haven't checked the sg, but smells like strong alcohol, I'm thinking about running it anyway.