at this rate
at this rate or at that rate {adv. phr.}
At a speed like this or that; with progress like this or that.
John's father said that if John kept going at that rate he would never finish cutting the grass.
So Johnny has a whole dollar! At this rate he'll be a millionaire.
"Three 100's in the last four tests! At this rate you'll soon be teaching the subject," Tom said to Mary.
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Source: A Dictionary of American Idioms