I'd suggest you just plant them out now, as whilst is a bit late for them to get established (depending on where you live -i.e. how cold it is round your way) there's not reallty any other option. The fleece will help protect them too.
I am a veg gardening novice. Someone has given me some small plug plants, calabrese, kale, cabbage, sprouts, onions. Can I plant them straight into my raised beds now with a fleece tunnel over them? Will they die?!