Do Jehovah's Witnesses accept meals on wheels for the elderly in their congregation?

Yes, Jehovah's Witnesses have no prohibition to accepting state or private help or aid if they duly qualify to receive it.

Note: Given the particularities of the elderly, and their special needs, it should be noted that individual Witnesses (or their families) are free to make their own personal decisions in this regard and not all Witness families will decide to accept the provision of a pre-prepared food provision service ("meals on wheels").