Yup sunset is in less than a hour, cold ground fresh cold air mass they should drop. The battle won't be the airmass we have but the low track which is why if your a winter weather lover you need it as cold as you can possibly get it and you want some cooperation with the low.
That said there should be a good initial thump with the moisture available. The earlier it moves in the better.
-Keep clear to partyly cloudy skies so temps drop like a rock after sunset.
-Get clouds to roll in before sunrise
-Pray for decent front end thump. Have seen situations where a decent surprising front end thump along with a slightly favorable LP track holds more places over to the wintry precip side longer before any changeover occurs. There have been worse set ups.