Find a regular at a time that works for you and then establish a routine for that time and day weekly (fortnightly) and stick to it. This becomes established in your missus' head and elicits no ongoing suspicion. Turn off google timeline, stick phone on vibrate. Have a general habit of not answering the ph to missus every so often. 'I was driving/being served/talking etc.'

Have routines that take you away from house on regular basis. Have an excuse ready for the inevitable 'oh such n such saw you in Chatswood' query so you can just roll it off the tongue without hesitation or surprise.

Be James fucking Bond basically.