Covering tomatoes during a cold snap

Hello... during a few days of spring we bought/planted some sturdy 8-10" high tomato plants. No fruit, no flowering. Then we had 2" of snowfall! Fortunately we covered them (milky colored heavy plastic & stakes) beforehand & they did well. Snow is gone now, they've been covered 2 days. Yesterday I opened it up for a few hours on one end for air only/no sun. Skies are very cloudy still & rain coming tonight & over next couple of days.
Question: Do I keep them covered --OR NOT? Day temps are only in the high 40s-mid 50s/some wind. When it rains it'll be a cold rain. Are they OK covered up until Monday when temps even out?
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