I'm going to say yes, simply because we don't know what will change between now and the time you arrive. It may be that by that time you'll be able to use the app to make changes. It also lets you keep track of ticket numbers just in case they get misplaced.
Since you can have them removed from your MDE (there are loads of threads on here about people making mistakes and having to do that) there really isn't any risk.
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