Im new here, so if I have posted in the incorrect section of the forum please advise

So this is the current situation
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I am the Uk citizen living in London. My wife with whom I have been married to for over 2 years is from Thailand. We have a 2 year old son together who has both Thai and British citizenship.
My wife is currently in the UK with me and our son on a 6 month visit visa.
I have been working in my current job since 6th march this year. My salary exceeds the financial requirement of 18,600 per annum. So it is now coming upto 7 months working with this company.
What I would like to do if possible
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I would like to change jobs if possible before the end of this month. Reasons for wanting to change have to do with wanting a higher salary and other variables. After the change of job, I would be looking to apply for my wife's settlement visa to the UK.
I am aware that if I apply after starting the new job that I would be going about qualifying for the financial requirement for my wife's settlement visa under category B.
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My question is, would I be able to meet the financial requirement once I have applied this way? Apologies if this may be a silly question, but I would just like some clarification on this so that I can make the decision to move to another job.
Thanks for listening, and look forward to any reply's or criticism

Mike.