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I want to verify the changes I plan to make and also see if there is anything else I should look out for.

Currently we have a domain hosted with company A with the nameservers pointing to our telecom company which is hosting our website.

Our MX records point to Google as we have Google Apps for Business.

We want to move off of the telecom's hosting and to another host.

We contacted the website designer who setup hosting with company B and created a copy of the website.  He said "The server's IP address is xx.xx.xx.xx. I believe once that is updated in the site's A record, it will be live at the new host.".

This is what I was planning on doing:

Lookup the current MX records for our domain and replace the current MX records on the DNS settings page for Company B

Add the TXT record that Google Apps requires for verification to the DNS Settings page for Company B

Login to the domain registrar and change the name servers to Company B's nameservers.

Is that all?

Sorry for the confusion.
>Currently we have a domain hosted with company A with the nameservers pointing to our telecom company which is hosting our website.

What I am suggesting is not to point your nameservers anywhere (parked").  Manage your DNS through your registrar.  

Let's assume your registrar is godaddy.  You have your current hosting at telecom1 and your new host is WebHostCompany2 and either way your mail will always be with Google.

When it is time to change, update godaddy so the nameservers are no longer pointing anywhere, they use the term, "parked".  

Step 1) "park" your name server

Step 2) Point the "a" record to the IP of WebHostCompany2

Step 3) Point your "mx" records to Google along with their recommended spf and dkim text records.

Now your good.  It is always better to manage your dns through your registrar.  Larger organizations will go a step farther and manage DNS separately.   For most small sites, what I have suggested is fine.

This way, if something happens to the website or WebHostCompany2, your email will always work via google (provided you are up to date on the domain name expiration date).  Or, maybe in a few years you change your web host again, now all you need to do is change the "a" record and never touch your mx records.

Hosting company B  will do that for you and they will
also transfter all your domain zone file to your new server so that
 you don't need to involve any MX, CNAME, named.conf, zone file stuff.
If current domain names is NOT kept by hosting B company,
your need to login into admin page at your domain registrar company and change
domain nameserver setting that point to hosting B's names
server provided to you, for example, ns1.hostingB.com ns2.hostingB.com

After 24 hours, propagation delay of your domain name transfer through
world wide, you will power your website correctly on browser under
hosting company B server.