I converted a rental property to primary residence. For depreciation calculation purpose, turbotax asks for a business %, is it still 100%?

It would be 100% up until the date that you took it out of service as a rental property.  

At the point that it was converted to a primary residence, the business use percent would be zero and depreciation would not apply unless a portion of the property was still being rented.

@AnnetteB6 Thanks for your quick response. This is clear now.