UPDATED 03/03/24
My unvarnished view about Trump's candidacy to the contrary notwithstanding, it is better for Trump to be ahead (rather than behind) in the polls. Polls do have some (limited) value as a predictor of presidential election outcomes -- though it is far too early to use them for that purpose.
In any event, with the release of four new polls yesterday and today, the latest numbers look like this:
Source: Polls reported by RealClearPolitics.
To avoid the over-representation of polling organizations that report frequently, the values plotted above include only the latest poll released by each organization. (Polls without margins of error are excluded.) The three-poll span affords a better indication of trends than the 10-poll average that I had been using.
CAVEATS: The average date of the three most recent polls is February 27 -- five days before the publication of this post. The numbers shouldn't be taken as predictive of the outcome of the election. They simply reflect the stated preferences of respondents when the polls were conducted. Also (and positively), a GOP candidate can win even when he is behind in the (meaningless) nationwide popular vote (see this).