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In the BOINC Manager you can click the Statistics tab and see the buttons Show user total, Show user average, Show host total and Show host average. The grid displayed spans a period of 30 days.

Where do the data come from?
From the file ~boinc/statistics_www.worldcommunitygrid.org.xml.
A snippet from that file looks like this:

    <daily_statistics>
        <day>1660780800.000000</day>
        <user_total_credit>142814789.169989</user_total_credit>
        <user_expavg_credit>24961.183546</user_expavg_credit>
        <host_total_credit>29551924.037008</host_total_credit>
        <host_expavg_credit>21427.303287</host_expavg_credit>
    </daily_statistics>
    <daily_statistics>
        <day>1660867200.000000</day>
        <user_total_credit>143087756.337775</user_total_credit>
        <user_expavg_credit>48580.223253</user_expavg_credit>
        <host_total_credit>29819030.168881</host_total_credit>
        <host_expavg_credit>44798.210151</host_expavg_credit>
    </daily_statistics>

Day after day, your credit is being recorded in this file.
The meaning of the elements is quite clear, they correspond with the labels of each graph in the Statistics tab:
<user_total_credit> = User Total
<user_expavg_credit> = User Average
<host_total_credit> = Host Total
<host_expavg_credit> = Host Average

The element <day> represents the number of seconds since the epoch.

1660780800 = Thu 18 Aug 00:00:00 UTC 2022
1660867200 = Fri 19 Aug 00:00:00 UTC 2022

If you multiply your BOINC credit by 7, you get your WCG points:

142814789.169989 × 7 =  999703524 (rounded)
143087756.337775 × 7 = 1001614294 (rounded)