Yes, adjust your numbers so that for the month ending in May your tax deduction equals the amount that TurboTax has for that period.
RE: your capital loss carryover and capital gain. You can apply the full $3,000 capital loss limitation to Q1 (and it will roll forward to Q2 and Q3), since you'd be able to apply that limitation regardless of whether you had capital gains. Then, in Q4, you can apply the remainder of the carryover that you would be able to use against your capital gain.
@JST4
