How much are the gross monthly earnings from the survey job? If your gross pay is $1180 a month from that job, you will be denied at step 1 on an SSDI claim. $1180 is the 2018 amount that determines you are performing SGA. That is 20 hours a week at $15 an hour. That would be enough to deny your SSDI claim because you are working.
If you are earning (from a job or self-employment) less than $1180 a month, SSA will look at your existing medical records to determine if you will be unable to do any kind of work (one that does not require you to be on your feet during the job hours - sedentary work). And whether or not it can be predicted that you will have a severe problem for 12 months or longer. One knee surgery and recovery time generally does not keep you out of the work force for more than a few months. My 88 year old mother had both hip and knee surgery last year and she is stronger and peppier than she was at 87. (she has other age related problems but the knee surgery was done in November and she got almost full flexion and extension after her PT and walks more this year than last year and was even planting flowers this week)
My suggestion is to save as much money as possible, pare down your expenses, put in more hours at the job you can do or find another simple sit down, low paying job, maybe a temp agency, and/or see if your state has a temporary disability program. I really doubt you will qualify for SSDI if all you need to do is recover from surgery. However, since the future is unknown and recovery is different for everyone, you could file the SSDI claim, get denied, appeal, get denied again and by that time, you will know if you can return to work or if you have to file for a hearing before an ALJ. My sister who had knee surgery could not wait tables while she was recovering, but she had worker's comp and was back at work in less than a year. She filed the SSDI claim and was denied, but since she went back to work, she didn't file any appeals.