The "elite" level designation is (for the most part) beyond JO levels 9 and 10, so if people are talking about an elite gym they probably mean a gym with an elite program (probably does TOPs and takes girls to Hopes/Elite testing) and/or is a national training center (produced a national team member). But there's no exact standard to it, just a designation people usually use to mean the program has aspirations to produce athletes beyond the Junior Olympic level.