OP, there are pre-schools that emphasize pre-reading skills (
https://www.ala.org/ala/alsc/ECRR/workshopsab/trainingmaterials/parentguidebrochuresa/T23bro.pdf), not reading. The good private schools and pre-schools do this (eg, NCRC).
I don't know if you can find that in DCPS/DCPCS or not. If so, it is likely to be the schools with more affluent parents, who, ironically, are less anxious about their kids showing reading progress, and with teachers and a principal who have been around for long enough to be able to focus on long-term, rather than short-term, results. The more play-based their philosophy, the more likely they emphasize pre-reading over reading.
The good news is that you can do at lot at home just by reading to and talking with your children.
Beyond that, what's important is a school that does differentiation. A kid that has solid pre-reading skills may "suddenly" become a very proficient reader around K when the skills all come together. Then they are bored to tears slogging through things the hard way. My children went to different NW DCPSs for K, and one school did great differentiation, and one school (at least that particular teacher) had the kids parsing sentences like "The apple is red." in unison.