Switching from Tier 4 dependent to Tier 2 visa - COS generation time period

[dineshanand750]

Hi all, I am currently on the Tier 4 dependent Visa and my employer has agreed to sponsor me. Employer has done with the procedure of RMLT test by advertising job in indeed and universal jobs for more than 28 days and has selected me on job of Business Development Manager out of all suitable candidates. only 4 applied for job and 2 turned for interview and i have been selected. My current tier 4 dependent visa expires on end of January 2018 and my partner has completed his course and likely to leave to home country today because of family emergency. My employer is willing to sponsor me and he still needs to get his tier 2 licence.

Just wanted to confirm:

1. How much this time of getting licence and COS generation is likely to take ?
2. If my wife leaves the UK earlier than me, will there be any issue for me for my COS generation and visa application considering I stay and continue work untill January 2018?