Spot on based on my work experience at Amazon. Working Saturdays from home was much better because at least I did not have to interact with those psychopaths from Retail.
Same, I've been able to focus best when finishing up something either during the weekend or when I allotted more OOTO time than I actually needed, I think it's just being in that (slightly) more de-pressurized state and no overhead of Slack pings and meetings.