She used to come for Christmas every year, then, Thank God, she took offence because Fred and George set off a Dungbomb under her chair at dinner. Dad always says she'll have written them out of her will - like they care, they're going to end up richer than anyone in the family, rate they're going ... wow," he added, blinking rather rapidly as Hermione came hurrying towards them.
Harry Potter and the Deathly Hallows
What does "rate they're going" mean in this context? Isn't it missing 'the', "the rate they're going"?