If you sum up day 1 and day 2 picks, below is the 2012 through 2021 hit rate on acquiring a all-pro or pro bowler across the NFL. The drop-off from the 1st to 2nd round is big. The Cowboys have done fairly well in the 2nd round drafting 3 Pro Bowlers and 1 all-pro over that time. 1st Round has netted 4 All-Pros and 7 Pro Bowlers. That's a 44% hit rate on an All-Pro over that time and 78% of the time with a Pro Bowler. The only 1st rounders to not make a Pro Bowl over that time period are Taco Charlton and Morris Claiborne. In the 2nd round that's a 10% all-pro hit rate and 30% Pro Bowl Hit Rate. If you want to exclude Jaylon Smith they're still slightly better than league averages in the 2nd round.
1st Round:
All Pro: 14%
1+ Pro Bowls: 37.5%
2+ Pro Bowls: 23.4%
2nd Round:
All Pro: 4.7%
1+ Pro Bowls: 15.3%
2+ Pro Bowls: 6.9%
3rd Round:
All Pro: 2.7%
1+ Pro Bowls: 11%
2+ Pro Bowls: 5.1%