How to Identify Active Contacts in Clay Tables for LinkedIn Campaigns

I have a list of contacts in a previous Clay table from a few months ago. I've added them to a LinkedIn campaign but getting very low connection rates. Typically if I source from Sale Nav I would select the option of 'Posted In Last 90 Days' so I know they are active. Anyone know how to find that information for 'Posted In Last 90 Days' once the data is within a Clay table?