Lost 42% excess body weight in 3 months, is that good?

I am 5'6" I started at 318. DR. wants 75% gone (130lbs) in 18 to 24 months to be successful. Only lost 55 lbs in 3 months but is equal to 42% of excess weight. Is that still good? I just don't feel like it is coming off very well. Any imput would be welcome & helpful.

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