No, you can't go to USA on a B2 Tourist visa.

Yes, your presence is not required for your wife to petition for your immigrant visa with the USCIS. The expected wait period for the visa process to be completed could be about a year.

If you would like to request a confidential legal advice or schedule telephone or email consultation regarding your specific situation, please email me directly at Attorney@law-visa-usa.com and I will send you a Questionnaire. Office Telephone line is 1-402-210-2040 (please EMAIL first to schedule a consultation appointment). I am an immigration attorney and work with clients from all States and globally. More information at http://www.law-visa-usa.com/.

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as mentioned above, your presence is not required for the process in US. you may wait for some more time, till you hear from your wife.

I agree with the advice of Luba Smal.