On a Red Hat 7 distribution, the yum list installed command can be used to determine if LVM is installed.

yum list installed | grep -i lvm

On a Red Hat 8 distribution, the dnf list installed command can be used.

dnf list installed | grep -i lvm

If LVM is already installed, something like this should be returned.

libblockdev-lvm.x86_64                 2.25-2.fc34                     @anaconda
lvm2.x86_64                            2.03.11-1.fc34                  @anaconda
lvm2-libs.x86_64                       2.03.11-1.fc34                  @anaconda
udisks2-lvm2.x86_64                    2.9.2-2.fc34                    @anaconda

If LVM is not installed, the yum install or dnf install command can be used to install LVM.

dnf install lvm2