Hi. As long as you entered legally on your H2-b visa and you have legally divorced your ex...you may marry your boyfriend whenever you'd like. Once you are married he could petition for you as a US citizen right away...your marriage to him will be valid but only if you divorce first. Good Luck!
Spouses of U.S. citizens may apply for adjustment of status if they entered the U.S. lawfully. This is true even if they overstayed, otherwise violated their status, or worked without authorization. Whether the USCIS will grant the application depends upon a number of factors that are best discussed in consultation with an experienced, knowledgeable and effective immigration attorney.
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You do not need to wait any specific period of time to marry your boyfriend after obtaining your divorce. I have had clients who were divorced in the morning and remarried in the afternoon. The issue for immigration purposes is whether your new marriage was legally entered into and is a bona fide marriage not entered into solely for immigration purposes.