you have 5+ yrs of experience after undergraduate degree means you are fully eligible to go for EB-2...you wont have any problem getting your GC approved if you dont have any criminal record. these days in Nepal's case, it takes only 7-10 months to receive the card. make sure your  company is paying the amount that DOL have specified for your area/ for your employment before  starting the process. Actually you are going to need that payrate after the day you get your GC approved. Talk with your company about it beforehand. once you have everything straight up, you will be fine...Nepalese still have a very good situation in GC approval trend if it is EB-2.