The full answer
Deli meat can be Halal when made from verified Zabiha meat and permissible ingredients in an approved processing environment.
Turkey or beef deli meat should not automatically be considered Halal merely because the animal species is permissible.
Processing matters.
Answers in the Halal Knowledge Center reflect the standards followed by Halal Monitoring Services (HMS), which operates as part of the Shariah Board of America. HMS certifies only what it checks.