meanwhile 前面可以加and

可以的。
比如：Eve was cutting the grass, and meanwhile Adam was planting roses.夏娃在剪草，亚当种玫瑰。

meanwhile也可以作副词，直接加在句子的开头，结尾或句子中间。
比如：
She's due to arrive on Thursday. Meanwhile, what do we do?她预定星期四到达. 这期间我们做什麽呢?
I went to college. Meanwhile, all my friends got well-paid jobs.我上大学去了. 那时我的朋友全都找到了收入不错的工作.

yes, why not?

当然可以啦