I was always searching for these answers so hopefully reading about others' progression will give you some indication. I hop ethis helps you in some small way. I am so sorry your husband and you are dealing with this terrible disease.
My dad's progression was something like this...
11/08 Super active and healthy, but was feeling tingling and twitching in legs, his Dr. said "it was nothing to worry about"
1/09 Downhill skiing in Colorado though he knew "something was off"
2/09 Foot drop and slight hand weakness, became noticeable to family
5/09 MRI and typical tests indicated ALS, local Neurologist DXd ALS on his 61st birthday
7/09 walking very slowly with a cane, difficulty standing w/o holding on, ALS confirmed by 2nd opinion Mayo/Rochester MN - told at this time they could see the ALS had already spread to entire body through the MRI, they considered his an atypical case and I believe at this time we were told less than 2 years
11/09 Lots of difficulty using utensils, dressing, buttons etc., could barely walk
2/10 Hired caretaker to begin assisting with dressing and bathing in morning and driving him to work
5/10 Using wheelchair full time, caretaker now working 12 hours a day to assist with driving, dressing, feeding, moving from chair to bed, chair to wheelchair, etc.
6/10 voice noticeably horse esp at end of day, can barely move arms and hands, got his PEG
9/10 very difficult to understand, no arm or hand movement.
1/11 no voice, no longer eating solids, all feedings through PEG
4/11 after a few months plateau, sudddenly looked like it was the end, very small, shallow breaths, caretaker said it was likley his last day, spend entire day with his family, received his last rights, he passed away the next morning.