Pooria, yes thats true, BGP RR are a part of your control plane and never a part of the forwarding plane as a best practise.
Hence since there is no next-hop pointing towards the RR's ever for any prefixes learnt no label is ever required to reach till the RR.
But in a scneario where the RR is placed in the forwarding path then MPLS needs to be enabled on the RR. For eg:
In the above hypothetical series connection scenario, the RR is in the forwarding path although it does only a control plane function. In this case it acts like a RR and also a P router, so MPLS needs to be enabled on the incoming and outgoing interfaces with LDP adjacencies.
But ideally, if a RR is used in a MPLS scenario then at maximum it needs to support VPNv4 address family only.
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