Bhagavad Gita, Chapter 18, Verse 57

Resigning mentally all deeds to Me, having Me as the highest goal, resorting to Buddhi-Yoga do you ever fix your mind on Me.

A real, complete instruction is given here, every activity, not just the special or sacred ones.

Krishna doesn't carve out exceptions for ordinary tasks, he names total dedication as the actual ask. Real consistency, across everything done, is what's being requested.