How do I make items grow to a certain size then stop

I want to make a small object like 0.1 units slowly grow taller over time like 0.01 a frame till it gets to one can someone please help

You can use Update it a coroutine. With Update, check if the size is one. If so, return. Otherwise set its scale to to Vector3.one times a float you increment. The float can be used for the check also.
If you use a coroutine, do the check in a while loop. Font forget yield return null in there.