It shall be the duty of every employer to notify his employes at the time of hiring of the time and place of payment and the rate of pay and the amount of any fringe benefits or wage supplements to be paid to the employe, a third party or a fund for the benefit of the employe and any change with respect to any of these items prior to the time of said change. Alternatively, however, every employer may give such notification by posting the aforementioned facts and keeping them posted conspicuously at the employer's place of business. Further, in cases where wages, amounts of any fringe benefits or wage supplements are set forth in a bona fide collective bargaining agreement and copies of that agreement are available to employes, then this shall satisfy the employer's duty to give notice.