The general guidelines outlined in the Codex Code of Hygienic Practice for the Transport of Food in Bulk and Semi-Packed Food.[1] should be followed, in addition to ensuring that employees delivering foods are free from COVID-19, coughing/sneezing etiquette is practiced by all involved in food transport and that frequent hand washing/sanitizing is practiced and staff practice physical distancing.
See also other Codes of Hygienic Practice for various groups of food http://www.fao.org/fao-who-codexalimentarius/codex-texts/codes-of-practice/en/