I am participating in the post-match process (PMP) but there is no quota indicated in the program description for the programs I want to apply to. Can I still apply?

Unlike first and second iteration of the R-1 Main Residency Match, programs participating in the post-match process (PMP) are not obligated to enter quota. It will be at the program's discretion to include that information or not. 

However, if a program is listed in the program description directory for the PMP, that means they are offering at least one position and you can apply to that program if you are eligible.