The most up-to-date farm system ranking is listed on Fangraphs. They use a metric that tiers MLB prospects and combines the values into a solid ranking. As per this formula, the Nationals are smack-dad in the middle of the MLB as the 16th ranked Farm System. The highest tier is labeled as "70 FV". To simplify, the higher the numeric value, the better the prospect.
The draft lottery is over and the order for the 2026 MLB Draft is pretty much set at this point, with the exception of picks moving around due to free agent signings. The Atlanta Braves are set to pick with the 9th pick, their own first round pick, and the 26th pick, which is the one they are receiving for Drake Baldwin's Rookie of the Year.