I remember reading somewhere if you take the puppies weight at 3 months and double t you'll have approximate adult weight.

That could give you a rough Idea on how big he'll grow - being small he'll be fully grown by a year.

My dog Lilly stopped growing at about 9 months and she weighs 7lb Zipper grew until he was about 13 months and he weighs 16lb.
The smaller the dog the less time they take to grow. lol

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A dog Possesses Beauty without Vanity,Strength without Insolence, Courage without Ferocity, And all the Virtues of Man without his Vices.