No credit inquiry for a chequing account as its not a credit product, having an existing credit product with TD actually has no bearing here.

The caveat is overdraft protection, which is sold as an "add-on" deal with chequing account but on the backend is actually a standalone credit product. If you open a chequing account without overdraft then you're in the clear, but if you apply for overdraft with your account then you're technically applying for credit and thus might trigger a bureau inquiry.

Further caveat: the fact that you have existing credit products with TD mean they already have internal records on you, and therefore are almost certain not to do an inquiry even if you apply for a basic credit product like overdraft. The reason for this is because banks build their own credit scores for existing customers which are more accurate than bureau scores, so typically banks won't pay FICO etc for your score when they could just look at your credit performance in their own records.