At what point of the design process do you start digitising your drawings?

Hello, I am new to type design and I am currently working on my very first typeface. So far I have sketched out most of the lowercase and uppercase letters on paper.

I was wondering, at what point do professional type designers start digitising the letters in a font editor? Is it better to move to the computer only after completing the design on paper first or is using a font editor earlier preferable?

Would love to hear your thoughts on this and learn about professional type designers workflows.