An offender is generally required to work while under probation supervision in Pennsylvania. An offender would generally be required to maintain employment and if they're not working, or if they were to, say, leave their job, they will be expected to make diligent efforts to find employment. There would have to be some compelling reason otherwise, for an offender not to have to work while on probation, for example, if they have a documented disability that prohibits them from working, but under almost all circumstances, the expectation is that an offender while being supervised on probation is supposed to be as productive of a member of society as possible and with that, the expectation would be that they're expected to work.
Being on probation, there are many obligations. You have to stay within the bounds of probation so as not to face probation violation. Having an experienced Pennsylvania criminal defense attorney will help you best understand what your obligations may be and can help best protect your rights and interest. They should be involved if you have any probation concern or issue.