We are a military family. our taxes were approved April 12th. Google says itll take 6-8 weeks to receive the check in the mail but we may move late June or July. should I come on time or can I change

[SteamTrain]

IF your file goes thru normally, I suspect it should be delivered to you by then.

...but if it isn't, there is a form 8822 to send to the IRS to inform them of your new address.

https://www.irs.gov/taxtopics/tc157

[theshuharts]

Sometimes army families wont have an address for months when we move we wont see our furniture or any mail for as long as we are on a waitlist for housing. Once we were wait listed for 3 months. Will this matter?

[SteamTrain]

Sure...that can be a problem no matter who you are.   That's why some people direct their refunds to a bank account....but of course then it helps to establish your banking at a wide-spread well known nation-wide bank.
 
What you could do, if you trust them, is use the form 8822 to direct the refund to a parent's address  (it sends any IRS communication s to that address).  Then they can send it to you.  And you can re-do the 8822 4-6months later (should do it even if you already have the refund...to make totally sure the IRS knows where you've settled in).