3-5,000psi. The tanks are hoop-wrapped (fiberglass, basically) or composite-enhanced (kevlar, carbon fiber, etc) for weight reasons but they're still quite fragile all things considered and expensive. If you don't care about weight then 3AA or 3AL can be used. 3-5kpsi is the practical limit for pressure due to the fact that various valving, hoses and compressors are available in ordinary commercial service at that working pressure; beyond that things get very exotic and expensive very fast. One BIG difference is that ALL composite tanks have a defined service life that is specified in their special exemption certificate under which they're manufactured (typically 15 years) after which they're junk -- 3AA and 3AL (steel and aluminum) cylinders can be used forever provided they continue to pass their recertification (hydro and visual inspection.) It's utterly common to see welding cylinders with original hydro dates from the 1970s and even earlier; they're perfectly safe so long as they keep passing inspection. I have steel dive tanks with 1970s date original hydros and they're safe and in active use today.
The problem remains that range is still a fraction of that obtainable from gasoline or diesel in the same volume and mass, so it's not practical for a consumer vehicle. There's no way around the physics on that. For a commercial vehicle, however, it may be both practical and worth it from a life-cycle perspective as the fuel is cheaper on a per-BTU basis and the decreased maintenance cost is quite material. If you can whack some number of cents/mile off the operating cost of a trash truck (including the cost of the compressor at the depot) then it's DEFINITELY worth doing in such an application. Another place it frequently makes sense to do this is city buses; again, limited range requirement, LARGE vehicle (so tank size and mass is not much of an issue), the depot typically has gas service available and the vehicles all return there so there's no refueling problem and the decrease in operating and service expenses is a big bonus as well.