Possibily
The nature of this claim is very temporal; so I've limited it to polls in near proximity to Oct 7.
Note that there are multiple levels of opinion about actions taken:
The accused is possibly guilty, and there should be investigation.
The accused is probably guilty.
The accused is guilty.
For context, I've shown each opinion for each person.
|-----------------|----------------|-----------------|-------------------|
| | Investigation | Probable guilt | Impeachment/Guilt |
|-----------------|----------------|-----------------|-------------------|
| | 55% (CBS) | | 42% (CBS) |
| | 55% (IBD) | | 50% (IBD) |
| Trump | 49% (Monmouth) | 58% (Pew) | 45% (USA) |
| | 55% (WSJ) | | 24% (WSJ) |
| | 54% (Pew) | | |
|-----------------|----------------|-----------------|-------------------|
| | 43% (CBS) | | |
| Biden | 57% (IBD) | 42% (Monmouth) | |
| | 42% (USA) | | |
|-----------------|----------------|-----------------|-------------------|
McCarthy's primary claim was that more people wanted to investigate Biden (lower-left) than impeach Trump (upper-right).
Comparing those produces a mixed result. If you choose the IBD/TIPP poll, then the answer is "yes": 57% to 50%. Other results are within margins of error.
As for the secondary claims:
those who current agree that [they] want the President impeached, 73% of them already wanted to impeach before anything they saw [in the recent news]. The majority of Americans (63%) believe he shouldn't be impeached for anything on that phone call.
I can't find support for the first number. According to Pew, 93% of people favoring an impeachment inquiry in October had also favored impeachment proceedings in September.
The second number is supported, assuming the "insufficient evidence as yet" crowd is counted in that number.