The most recent of your jobs finished about an hour ago at Galaxy Main https://usegalaxy.org.
Jobs can queue up to 24 hrs. Most will run much quicker than that. The queue time can vary and depends on factors such as how many other users are active on the server at any particular time. https://galaxyproject.org/support/#datasets-and-histories
If you are working on a different Galaxy server, contacting the administrators is how to find out if your jobs are just queued or if there is a server problem. Contact information is commonly on the home page of the server, or you can check here: https://galaxyproject.org/public-galaxy-servers/
Thanks! Jen, Galaxy team