Where does the lector bow?

when I approach the altar to read I bow when I’m on the 1st (bottom) step is this OK?

Ceremonial of Bishops, No. 72:

A deep bow is made to the altar by all who enter the sanctuary, leave it, or pass before the altar.

Where exactly you bow (before the step, on the step, at the top of the steps, etc.) depends upon the local custom of your parish.

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