Impossible to determine with any level of accuracy...upgrade time depends on pilot group/fleet size (ie. growth or contraction), block hours, and attrition.

That being said, the junior CPT award is generally around 60-65% overall seniority and Feb 2020 hires are about 72% overall seniority so I'd guesstimate mid-2026 (give or take a year) for first available upgrade opportunity.

This prognostication is worth exactly what you paid for it, caveat emptor, semper gumby.