This question could be looked at in a lot of ways. In this instance, the Zillow blog mentions which day of the week is best for listing your home:
Selling or buying? Better check that calendar …
And what’s the best time? Thursday mornings. The reason is two-fold: Your home will be available for showings that weekend, but it will also be a fresh-on-the-market listing (list it any earlier in the week and by the weekend, it’s already looking a bit stale). Why is this important? You’re more likely to get a full-price offer if your home has been on the market for a short period of time.
Being Monday, that gives you 3 days to whip your house into listing shape.