Incorporated but still operating as sole-proprietor

Hello,
I incorporated in May 2018 but continued to operate as a sole-proprietor up until March of 2019 (in other words, I did not set up new GST/HST account, new bank account under the corp name, payroll etc until March of 2019). I was planning on filing T1/T2125 and GST/HST return for 2018 as a sole proprietor since business did not operate as a corp. Than, for the period of March 2019 – Feb 2020 I’ll file corp tax return when the time comes. Am I correct in this approach?

Thanks so much.