Giunea pigs what should i do ?

I'm guessing your in the UK yes it's fine our boys went outside weeks ago. it sounds like you have done everything right. I would sugest though that you put them out in the day and bring them in at night for a few days to lef them get used to the sounds and smells outside as they have never been out before. they should be just fine. have fun with your new pets. they are very rewarding