Offline install xfsprogs?
 

I have a CentOS 7 server that is offline. I want to check the XFS filesystem. how can I install xfsprogs manually?

Also can I do a xfs_check on a mounted filesystem?

If you have that package on disk use:otherwise both: https://yum-info.contradodigital.com...base/xfsprogs/ ;)

Offline as in not connected, or offline as in not working ?.
The only time I installed CentOS 7 it defaulted to XFS, so I find it odd that you have a system without it. If you mean you can't run xfs-repair because the filesystem is broken, the last thing you should be considering is attempting to install anything. Fire up a liveCD and do the repair from there.

I am offline. I simply want to download the yum package in full and install it locally. I have no internet access. Is that a thing?

Nope, I misinterpreted your situation.

xfs_check has been deprecated and replaced by xfs_repair.

As stated xfs is the default filesystem. xfs_repair should be installed by default and yes the file system needs to be unmounted.