I think the biggest key to weights training as already stated numerous times is to make sure it doesnt impact on sprinting. In that regard theres really no ‘number’ to aim for rather you should continue to gain strength in a manner which allows you to avoid feeling tired from weights the following day.
Earlier someone made a post regarding technique, this is alittle off topic but personally pilates has helped me more so than purely weights ever did as it has allowed me to actually unlock more of the strength gains from the gym. Sometimes i think people hit big numbers with their weights but in terms of actually turning that into speed they only use a very small proportion of that strength whilst sprinting.