You should start by reviewing with your Eye MD the above history. Normally my patients going on long term steroids I see every six months. If your pressure is high or you have other risk factors a baseline glaucoma evaluation might be done: visual field, optic nerve photos, gonioscopy, central corneal thickness measurements and optic nerve OCT.
Steroid glaucoma can develop in as little as 2 weeks but that usually steroid eye drops. for oral medication I suspect 3-4 weeks would be average. Also systemic vasculitis can get in the eye.
JCH IIIMD